Absa bank sms notification on my new contract numb

On the 23/02/2016 I entered into a contract with mtn as I purchased a cellphone I was given a number *** from that day as soon as the SIM card was activated I received absa bank sms notifications on my new number every time there is a deposit or withdraw from this unknown absa bank account I receive notifications.i visited mtn branch in polokwane to report this matter I was simply told to ignore it.Im now fighting with my wife as she thinks I have a secret absa bank account I told them to either cancel the contract or fix the problem and it was not fixed till now I'm frustrated <br>