MTN still *****ing my money after contract cancellation once my contract expired.

Be aware that even once your contact with MTN has expired they still ***** your money, they stole my money thoughout my contract and now after my contract has expired and I proceeded to cancel they are now billing me as below response to my email to customer care requesting how much they will take off my account*Please be advised that your debit order will be for the amount of R 1,968.44. I asked customer care as I have such fear of MTN over charging me and steeling my money. now what solution to this continued problem get my lawyer involved...