Homechoice are *******

Homechoice is nothing but the biggest ***** of a company, I had bought blankets from homechoice I was meant to pay R346 per month but upon receiving messages after every payment I realized my interested was increasing instead of discreasing so i decided to just settle the account in full of which i paid the outstanding amount of R3100 after I had paid that I got a message saying my outstanding balance was R7.56 I paid R10.00 now I got another message saying my outstanding balance is R57.90 what the hell for when I have already made 3 payments in 1 month and over and above what i owed them why is homechoice *****ing me so much when I have been nothing but a good payer? They are call centre number is always busy