Cancelling a Contract that already expired - WORST Service !

I have requested for my data sim (that expired and has not been in use for years now) to be cancelled about a year ago with my phone upgrade (had 2x contracts). Now a year later, I realized that I am still being billed and paying for this line that is NOT BEING USED and I have requested to cancel via telephone AND email - still being debited from my account. Look - it is not a massive amount (like R110) BUT it adds up over the months .. When you go into a shop, they anyways have to phone the relevant department as they cannot help you in store. Today - Vodacom phones me to say I can pay less on this data contract for more data (such a *******) and when I raised the fact that I have requested for this line to be cancelled a year ago, the line got conveniently. I am STILL paying for a contract with extra airtime and data so its not even losing a client. WORST customer care service in terms of cancelling a contract.