diff --git a/libs/common/src/helper/differenceInSeconds.ts b/libs/common/src/helper/differenceInSeconds.ts
new file mode 100644
index 0000000..9f05d67
--- /dev/null
+++ b/libs/common/src/helper/differenceInSeconds.ts
@@ -0,0 +1,4 @@
+export function differenceInSeconds(date1: Date, date2: Date): number {
+  const diffInMilliseconds = date1.getTime() - date2.getTime();
+  return Math.floor(diffInMilliseconds / 1000);
+}
diff --git a/libs/common/src/modules/user/entities/user.entity.ts b/libs/common/src/modules/user/entities/user.entity.ts
index 11dcd5c..acc9ad7 100644
--- a/libs/common/src/modules/user/entities/user.entity.ts
+++ b/libs/common/src/modules/user/entities/user.entity.ts
@@ -1,4 +1,11 @@
-import { Column, Entity, ManyToOne, OneToMany, Unique } from 'typeorm';
+import {
+  Column,
+  DeleteDateColumn,
+  Entity,
+  ManyToOne,
+  OneToMany,
+  Unique,
+} from 'typeorm';
 import {
   UserDto,
   UserNotificationDto,
@@ -155,6 +162,9 @@ export class UserOtpEntity extends AbstractEntity<UserOtpDto> {
   })
   type: OtpType;
 
+  @DeleteDateColumn({ nullable: true })
+  deletedAt?: Date;
+
   constructor(partial: Partial<UserOtpEntity>) {
     super();
     Object.assign(this, partial);
diff --git a/src/auth/dtos/user-otp.dto.ts b/src/auth/dtos/user-otp.dto.ts
index bab47c8..043eebc 100644
--- a/src/auth/dtos/user-otp.dto.ts
+++ b/src/auth/dtos/user-otp.dto.ts
@@ -1,6 +1,12 @@
 import { OtpType } from '../../../libs/common/src/constants/otp-type.enum';
 import { ApiProperty } from '@nestjs/swagger';
-import { IsEmail, IsEnum, IsNotEmpty, IsString } from 'class-validator';
+import {
+  IsEmail,
+  IsEnum,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from 'class-validator';
 
 export class UserOtpDto {
   @ApiProperty()
@@ -12,6 +18,11 @@ export class UserOtpDto {
   @IsEnum(OtpType)
   @IsNotEmpty()
   type: OtpType;
+
+  @ApiProperty()
+  @IsOptional()
+  @IsString()
+  regionUuid?: string;
 }
 
 export class VerifyOtpDto extends UserOtpDto {
diff --git a/src/auth/services/user-auth.service.ts b/src/auth/services/user-auth.service.ts
index 08d0c42..e17f599 100644
--- a/src/auth/services/user-auth.service.ts
+++ b/src/auth/services/user-auth.service.ts
@@ -18,6 +18,8 @@ import { EmailService } from '../../../libs/common/src/util/email.service';
 import { OtpType } from '../../../libs/common/src/constants/otp-type.enum';
 import { UserEntity } from '../../../libs/common/src/modules/user/entities/user.entity';
 import * as argon2 from 'argon2';
+import { differenceInSeconds } from '@app/common/helper/differenceInSeconds';
+import { LessThan, MoreThan } from 'typeorm';
 
 @Injectable()
 export class UserAuthService {
@@ -114,7 +116,7 @@ export class UserAuthService {
   async deleteUser(uuid: string) {
     const user = await this.findOneById(uuid);
     if (!user) {
-      throw new BadRequestException('User does not found');
+      throw new BadRequestException('User not found');
     }
     return await this.userRepository.update({ uuid }, { isActive: false });
   }
@@ -124,7 +126,55 @@ export class UserAuthService {
   }
 
   async generateOTP(data: UserOtpDto): Promise<string> {
-    await this.otpRepository.delete({ email: data.email, type: data.type });
+    const threeDaysAgo = new Date();
+    threeDaysAgo.setDate(threeDaysAgo.getDate() - 3);
+    const userExists = await this.userRepository.exists({
+      where: {
+        region: data.regionUuid
+          ? {
+              uuid: data.regionUuid,
+            }
+          : undefined,
+        email: data.email,
+        isUserVerified: true,
+      },
+    });
+    if (!userExists) {
+      throw new BadRequestException('User not found');
+    }
+    await this.otpRepository.softDelete({ email: data.email, type: data.type });
+    await this.otpRepository.delete({
+      email: data.email,
+      type: data.type,
+      createdAt: LessThan(threeDaysAgo),
+    });
+    const countOfOtp = await this.otpRepository.count({
+      withDeleted: true,
+      where: {
+        email: data.email,
+        type: data.type,
+        createdAt: MoreThan(threeDaysAgo),
+      },
+    });
+    const lastOtp = await this.otpRepository.findOne({
+      where: { email: data.email, type: data.type },
+      order: { createdAt: 'DESC' },
+      withDeleted: true,
+    });
+    const cooldown = 30 * Math.pow(2, countOfOtp - 1);
+    if (lastOtp) {
+      const now = new Date();
+      const timeSinceLastOtp = differenceInSeconds(now, lastOtp.createdAt);
+
+      if (timeSinceLastOtp < cooldown) {
+        throw new BadRequestException({
+          message: `Please wait ${cooldown - timeSinceLastOtp} more seconds before requesting a new OTP.`,
+          data: {
+            cooldown: cooldown - timeSinceLastOtp,
+          },
+        });
+      }
+    }
     const otpCode = Math.floor(100000 + Math.random() * 900000).toString();
     const expiryTime = new Date();
     expiryTime.setMinutes(expiryTime.getMinutes() + 1);