Please help with Vodacom

Been having a contract with Vodacom since 2022 September and the contract was supposed to end march 2026 and I terminated the contract on December 2025 and paid the penalty fee for the cancellation and received cancellation documents to show everything is done but they keep on deducting money and when I called they say that the only contract that was cancelled was for one phone while they were both on the same contract and they say that the account is in arrears and been handed to lawyers tried contacting those lawyers they don’t give me any details and not coming back to me I have receipts and the cancellation document but they still deducting and besides the contract was supposed to end in march