MTN SA-NEARLY IMPOSSIBLE TO CANCEL EXPIRED CONTRACTS

After I reached the expiration of my two 24-month contracts, I visited a MTN store to cancel both and I was told that it cannot be done and could only be done by myself through calling 135 from my MTN sim. After several calls and staying on the line for 20-30minutes, once the person who ought to help me cancel my contract fails to convince me to take some form of upgrade, they simply hang up. The one gentleman blatantly told me that he cannot help me cancel my contract and that I'd have to speak to someone else and sumply hung up. I was on a SIM-ONLY 10GB plan in the one sim, and now I'm paying the normal price per GB because I'm on a "month-to-month" plan(do the math). After several failed attempts through the 135 number, I called the MTN Custome Care via 083 135 and there was a glimmer of hope when a gentleman kindly told me that he'll assisit me and I felt optimistic to finally get those contracts cancelled, however, the gentleman started with his system being slow and constantly reminded me to stay on the line because his system is slow. He eventually told me that he doesn't have the "tools" to cancel the contracts but he'll transfer me directly to an agent...and hung up. I even sent MTN Customer Care a mail-NO RESPONSE.