Incurring account

In November 2014 last year i ordered 2 items at Home Choice monthly instalment of R55.00 for 16months. Started paying R100.00 for 4 months. In May 2015 i order 2 items again. I phoned call center asking for the settlement balance for the first item. i have been told there is no settlement amount as the account carried forward. So i have to pay until i finish my instalment. I asked them where are the R100.00 that i was paying because you not saying my account has been reduced or anything. What must i do to know how much is outstanding from the first order. I asked them to give me printout of the first items and they still refuse. Where to complain about this because when you call you go through to call centre and you answered by rude people and they don't help you at the end they put the phone down on your ear. Must i pay until April 2016 the R55 every month. What a ****************