Mtn Cancelation Department has Poor Service

I had a contract with them and it expired 23/03/2020,They have been debiting from my account till now in November when I stop their debit, then I phoned them trying find out why they are still debiting they say it's because they are giving me minutes and my Sim card is not active anymore since 2019 so I couldn't have a problem with that, but then I called them twice last week wanted to cancel my contract with them, then I was transferred twice waited for consultant almost 1h30min till I dropped the phone