MTN shame on you!!

I am so disappointed in MTN and have been trying to cancel my mobile number since Sept 2019 when my contract was supposed to expire. I left the country 1 month before my contract expired and they would not help me, I was told to give a letter to my son and MTN will cancel it.. no surprise that it was not and we still trying to cancel it 3 years later and the sim and number has not been used as I have the sim card abroad. I was diagnosed with cancer Nov 2020 and with treatment cost could not send money home to help my son pay for the MTN bill, he is now a few months behind and his number is linked to mine.. no brainers that they have now blocked his number. Shame on MTN for continuing with contracts after the 2 years are up and not assisting us to cancel when we requested it. Even after I explained to the MTN staff I will be out of the country and cant do it personally, he said it was no problem and to send the letter in. Which I did and my son made numerous personal visits to the branch. How can MTN charge for a contract that has expired and not been used since Sept 2019!!!