Vodacom needs to pay me back

I'm very upset about this , vodacom gave me a invoice quote for 2 for my number for a premature cancelation on the 14th January 2022 and I hade 17 days to do it like it should on the invoice quote, I did the payment on the 15th January 2022 and send the forms back on the 17th January and they only canceled the numbers on 31st January and now I hear the invoice quote is wrong and it did not include January payment in and now they did a debit order on that outstanding balance that is over R2000 extra because the person how helped me did not include January invoice because there was no invoice for January at that time only after I did the payment, now I'm getting the short end of the straw and I don't have the money to pay for my personal stuff