RCS ****...day light robbeey

I am a Game store customer with the game store card under written or under RCS...I purchased cellphone for R4000 last year 2023 September and stated paying Noverber R500 for next coming months and February 2024 paid 1000 asked for remaining amount only to find out it is R2800 was so shocked and angry complained at called the RCS call center I was told it's interest and other monies asked for the break down of these monies it added up to 200 so it didn't make sense....last month March 2024 paid 1000 again asked for remaining amount it was R3500 ...I was so defeated RCS is a **** I'm paying triple of the initial amount.... RCS needs to be investigated this is day light *******.... instead of the bill to decrease its increases every month RCS is reping us off....Please don't take any store cards under written by RCS ...Game and Makro are stores I know that have RCS as their financial under writer....RCS is a ****