Vodacom wants to charge extra

I started a contract on the 7/10/2021. The contract is suppose to end on 7/10/24, which is 36 months. Vodacom is charging me until the end of October 2024. When i query it with them, they saying that because the contract ends on the 7/10/2024, I have to pay specifically for the hand set until the 30/10/2024. I’m paying more for a handset than I suppose to. But they wouldn’t hear of it. They saying that the handset is only going to be paid off at the end of October 2024. Logic tells you otherwise, but they won’t hear of it. The person I spoke to, his name is Liyembe. He would give me his last name.