Cancel a contract at Vodacom is a nightmare

I had a call this morning with Muzi Sibanda at cancellation department asking about my contract that my contract ended on the 31 of Jan 2020 and I gave notice 30 prior but it seems like the contract is not cancelled.

Muzi Sibanda was VERY VERY RUDE and i did not like they way he spoke to me, and when i asked to talk to the manager he advised me that the manager went to the meeting and I should call at 10:30am. He couldn't want to listen to me as vodacom did not cancel my contract and there is money owing on my account which i do not understand. he advised me that Vodacom (cancellation department) doesn't record anything when the customer cancel the contract. Then i called again spoke to Siyabonga Madoda at 10.25, he advised me that I should go to vodacom store then they will assist me of the records but he cancelled the contract again. At the moment I am an unhappy costumer and it is not even the first time.