Unhappy customer

Hello Peter, I was owing Russells account R2000 so they handed my account to Acquifin and increased it to R8000. I had an arrangement with them to deduct R400 every month it's been 2 years now and next month in April 2024 was suppose to be my last payment so they did not deduct their money and they've sent me an sms saying I have missed payment while I have money in my account. They're taking my money every month but on my clear score it says "i own them R18000 and i miss payments"