How to insert data into three tables using Entity framework 6?

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I am able to insert data into "BankAccount" table. But could not make it for the other two tables for which I created two services. I also watched this in SQL profiler but no action happens when i run the code for inserting data into the two other tables.
Please HELP!!!!
This is my Controller:

[HttpPost]
        public JsonResult CreateNewUser(BankAccount newUser)
        {
            string message = string.Empty;
            if (ModelState.IsValid)
            {
                
                string pswdsalt = PassWord.GenerateSalt();
                string pswd = PassWord.EncodePassword(newUser.Password, 1, pswdsalt);
                newUser.CreatedDate = System.DateTime.Now;
                newUser.Deleted = "N";
                newUser.Password = pswd;
                newUser.PasswordSalt = pswdsalt;
                try
                {
                    db.BankAccounts.Add(newUser);
                    idGeneratorService.UpdateNewAcNo(newUser.AccountNo);
                    balanceService.CreateBalanceDetailsForNewUser(newUser.AccountNo);
                    db.SaveChanges();
                    message = "New User Created Successfully";
                }
                catch (Exception Ex)
                {
                    message = "Oops! Something wrong happened" + Ex.Message;
                }
                
            }
            else
            {
                message = "Oops! Something wrong happened.Please try again after sometime";
            }

            return Json(message, JsonRequestBehavior.AllowGet);
        }

and my two Service named "idGeneratorService" & "balanceService" :

public void UpdateNewAcNo(string AcNo)
        {
            TransactionIdGenerator acnoGenerator = new TransactionIdGenerator();
            acnoGenerator.AcNo = AcNo;
            db.SaveChanges();
        }

public void CreateBalanceDetailsForNewUser(string AcNo)
        {
            dailybalance.Id = Guid.NewGuid();
            dailybalance.AcNo = AcNo;
            dailybalance.Date = System.DateTime.Now;
            dailybalance.Balance = 0;
            dailybalance.Deleted = "N";
            db.SaveChanges();
        }