Impossible to get hold of, impossible to cancel account

If I could rate MTN lower than 1 star, I would. I immigrated and sed the app to pay my bill each month as i wanted to keep my number. In January, I couldn't get into my MTN account to pay my bill so contacted them asking for help. I decided to cancel my account, so paid my outstanding amount and requested a cancellation. I was told 2 different amounts that I had to pay and they ignored my questions about why I had to pay multiple amounts. They constantly switched people responding to me and none of the new responders read up in the email chain, so I had to repeat myself multiple times. I paid my account fully up to 27 Feb and demanded an immediate cancellation - no response. I emailed multiple times asking them to confirm that my account was cancelled - no response.