MTN is *****ing my money during these hard times of covid 19

MTN is *****ing my money. I cancelled my contract with them which ended in March. I am still being debited. Worst part is I have called over a year ago to cancel the aim card because it was ****** with the phone and I had no insurance so I paid for something without complaint that I don't have. MTN charged me an amount just over R200 in April, stating that they charging me for loading airtime on a simcard I do not have. I let it go. Now this morning I wake up to a bill of over R500 again for something I do not have that I have also cancelled with them. This is theft. Disrespectful. I want my money back for April and this current unauthorised debit order. It is disgusting that MTN would take advantage of people's accounts. We have children to feed and other bills to pay. I want all my money back!