Cancellation of Vodacom contract and arreas

Hello Peter can you please assist me I have a problem with Vodacom. I had a contract with Vodacom which ended September 2021, I continued to use their services until February 2022 and I called Vodacom to cancel my contract, the assistant that was helping me offered an upgrade and I declined but days after I got messages saying I've upgraded my contract. I phoned Vodacom so my times to resolve the matter but got no help until I started to reverse my money debit order and I've been trying to phoned them but still no changes my name is on arreas now.... please help