Home Loan Account Error by Standard Bank.

I Called Standard Bank Homeloan department to get feedback on my Homeloan Status. The Consultant in the Call Recording confirms that I have been overpaying every month, I evem said in the recording "ARE YOU SURE, as I dont want issues" She responded and confirmed that she is sure and I can pay R6000 if I want for October Installment. I went ahead paid abit more R7000. I'm NOW harassed by Standard sending me SMSs EVERYDAY that my account is in arrears and that they will send this to impact my credit Score. Exactly what is going on !!!!...I did exactly what the Standard Bank consultant said I must do and now I'm being punished for that !!!! This Cannot be Right how YOU treat Customers.