Bad service

I have opened a contract with mtn in the branch in newtown I've been having problems with debit orders not going through and when I try to make the payments it does not go through I even went into the branch now to make the payment it shows that the reference and the cellphone number is invalid I've been trying for months now to make payments and when I try to call mtn I get the same story of making the payment at the ATM yet mtn is quick to suspend the services but when I try to make the payments I get all kinds of excuses and stories from the stores and the call centres what pathetic service mtn is providing lately why should it be the customers duty to make sure the debit orders goes through yet its on the system and should go off automatically now its the customers problem that the debit orders are not going off how pathetic really