MTN contract cancellation woos

I have been trying to cancel my contract with MTN since the 17 of April 2023, when you call their customer support number you get sent from pillar to post and when you eventually get through to the retention department, wow... their line suddenly does not work properly and the line gets dropped. so I went to their Facebook page on Messenger and I was chatting to ML who promised to escalate the issue and even confirmed that the contract will be canceled in 30 days from the 16th of April to honor the notice. This was not done despite ML's promise as I have been billed for the month of June and received confirmation from Lonwabo that the contract was not canceled, thank you so much for being kind and helpful Lonwabo, I know you tried your best. Lonwabo transferred me to the retentions department and their usual tactics started, I could hear the lady very much despite her saying that she cannot hear me and suddenly the line was dropped. All i am asking is for MTN to honor their part of the bargain and cancel the contract as i have met all my contractual obligations with them, they have always received their money without failure for the past 24 months, if ML failed to escalate the cancelation on MTN site, that has got nothing to do with me as I believe ML represents MTN. The system failure was on the MTN site and not on mine, it is also not my fault as a customer that I cannot reach you on your lines. looking forward to your response