Handed over but vodacom can't produce the contractual agreement

Vodacom is an utterly disgrace, if they had zero stars I'd give it to them. I cancelled a contract with vodacom, after the cancelation they continued debiting money. I've raised the issue multiple times. So then eventually after someone called me back informed me the contract is closed and will no longer be debating, I was handed over to a collections company for a data contract that apparently is on my name( one I never took out). Since being handed over I've asked both vodacom and the collections company for the contract that they claim I've agreed to. Since November 2022 they could not produce a contract..I've asked multiple times telephonically for the agreement, to no avail. Vodacom if possible since your emails are always full or not working could you help me get hold of the contract as soon as possible. I'm sorry but can't pay for something that I never agreed to .