My API keeps loading after sending data to the database and ignores my return responses -NESTJs

Question

SwaggerApi After sending data to my database, swagger keeps on loading in NESTJs. My responses are completely Ignored. The "IClientInterface" contains the feedback.

Controller for the POST endpoint is this: constroller.ts

@Post('account')
@ApiOperation({summary:'Create a new account'})
@ApiResponse({status:400, description: "Bad Request"})
@ApiResponse({status: 201, description:'Account created succesfully'})
async signUp( @Body() signUpDTO: SignUpDto ){
await this.userService.createUser(signUpDTO);
}
}

The service the post endpoint calls is this: service.ts

async createUser(payload:SignUpDto,) : Promise<IClientInterface>{
try{
payload.email =  payload.email.toLocaleLowerCase();
   const emailExists = await this.userRepostory.findOne({where:{email:payload.email}});
   if(emailExists){
    return feedBack({
        error:true,
        errorMessage: `email ${payload.email} already exists.`,
        statusCode:400
    })
   }
const userData = plainToClass(UserEntity,payload);
userData.createdBy = payload.email;
userData.email = payload.email;
userData.date =  new Date();
const saveUser = await this.userRepostory.save(userData);
if(saveUser && saveUserPass){
     return feedBack({
    statusCode:201,
    error:false,
    errorMessage:null,
    sucessMessage: `${userData.email} succesfully created`
 })
}
}
catch(error){
 return ({
        statusCode: HttpStatus.INTERNAL_SERVER_ERROR,
        errorMessage: `Error while creating user - Error: ${error.message}`,
        error: true
      });
}
}