Mtn will always keep taking your money, even after cancelation

If I could give 0 stars, I would. Negative stars maybe?! MTN is the absolute WORST! I canceled my contract timeously, via email, yet kept getting billed. I contacted MTN via mail, because I don't have an MTN Sim, various times... and am still being sent accounts... I also received mails from a debt collector and since mailing them details of when and how I canceled, again receiving accounts from MTN themselves. My contract was CANCELED in time, as per your policy. It is not my fault your internal systems are so shoddy that you cannot process a cancelation in time. Also, your shop at mall@reds advised I reverse the payme ts if you keep deducting, as even they are aware your cancelation process is terrible. To be clear, I haven't had these Sims for ages, and have canceled this account. Please process it as such and remove the outstanding from my name.