Cancellation of contract

I cancelled my contract two years ago after the contract expired. The payment to Vodacom continued till July this year after a huge attempt from me. Now Vodacom blacklisted my name at TransUnion. What am I to do now? The contract is cancelled 5 times now, and still they let my credit score go down the drain. Every time I email them, there is another problem. I want them to pay back all the debit orders that went off after cancellation and to set the scoring correct at TransUnion..