Bad Customer Service Head Office

I have been in contact with MTN since July 2022 regarding ***** on my account sent through Police affidavit. I requested my Limit be set very very low. No problem a charge for 30 gb comes through every month well over R 1,500 and the NEW Debit order is now set to deduct this monthly. I have telephoned accounts dept, sent emails to Customer Care receive emails that credit has been past and low and behold next month same thing. How long is this going to carry on for. I will be changing Cell phone contract to Vodacom as soon as my contract expires. Hopefully they have better Customer Care.