still dealing with the incorrect billing amount

i have been going through this from last year ocotober they keep debiting and sayign that i owe money then its sorted and the next month they debit like three times, i went to the midrand branch where i was assured that it was sorted and even given a reference number 522007, everything was sorted and the phone worked for 2 months, then in january they started deducting like 3500 and when reversed they cancelled the use of the phone , and then they had their creditors phone asking for the money and one lady was particularly rude even though she refused to see the ref number or understand the situation, i phoned and atleast a kind indian lady said that it was a mistake and she rectified it and the phone worked for a month till the same process started again. i got a final demand for payment, phoned and was sent a recon where it even shows that they cancelled the amount and then out of the blue the money shows owed again. i phone they say they will check with lydia madlala who promised to get back to me 2 weeks ago still no answer from anyone, and when i put the hello peter post they phone once and never again till i load another complaint. how bad and usless are their staff really.