Summoned for final debit, although paid up in full

My wife and I paid our 24 month contracts in full before the end of April 2021. We called the call centre and went into the Voda store to inquire as to whether we will be charged a final debit. The shop said no, however, the call centre said yes. Either way, we left the money in the account to be debited which Vodacom never did. A few days ago, we were both summoned for the final debit which they never took. No warning, no phone call or anything. Pathetic. Now we are threatened with poor credit scores bla bla bla, credit bureau etc. We would like to buy a new house, therefore we have no choice but to pay this. Quite disappointed in Vodacom and their lack of communication and all-round professionalism.