******* by homechoice

I took some items on credit with homechoice 2 years back , and we had an agreement that I will pay the on a monthly basis which I have been doing every month without fail. I was suppose to finish paying the account in June and they send me an SMS stating that I owe the around R120.00 I paid it and this month I get an SMS that I owe R7,50 on Thursday I paid R10.00. The next thing I get an SMS that I owe R6.00 I don't owe homechoice and what I know is that they going to add interest it will end up increase which is redicilous ,when I called they said when I pay at pick n pay I pay an extra R7 for service fee which they never informed I don't have time for please homechoice leave me alone I don't have any business with you