Sold a lie and now they refuse to cancel contract whilst they have their devise

Took a contract with MTN SA during my conversation with their supplier Mondo, I did disclose that I will be moving to another area therefore, can they please confirm if there's a coverage in the new area ill be moving to which they have confirmed YES. The cancelation process has been in process since Jan 2023, aren't sure if this is their strategy to keep on debiting from my account. It's so annoying cause everytime I contact MTN, I have to explain my story 100 times to a consultant. This is totally a waste of time especially from a big brand like MTN. Today it's even worse cause their cancelation department is not working, the line keeps on cutting and no one is coming back to me. Can I please get a cancelation done cause this up and down I'm doing is totally not on. I have returned your devise in good condition so please do the right thing and stop playing with my bank account. As for Mondo Group, bunch of *********** people who will never take responsibility.