Being charged fees I do not understand whic is more than agreed upon

In April 2017 I purchased a five piece bedroom suite, two wardrobes and 3 mink blankets from Homechoice. According to the first two emails received from Homechoice which I only discovered today, my items including the facility account fee, assemble fee, delivery fee and finance charges would be as follows: 5 piece bedroom suite = R 13 974.85, the 2 wardrobes = R 9 446.46 and the 3 mink blankets = R 2810.20 with repayments of R 389.00 for the bedroom suite over 36 months, R 197.00 for the 2 wardrobes over 24 months and R 118.00 for the mink blankets over 16 months which adds up to R 704.00 per month. My first payment in April 2017 that was due was R 510.00 and I thought this was because the bedroom suite was not delivered yet. When it was delivered my new payment due was R 1490.00 which I understood as the consultant that I made the sale with told me this over the phone initially. But upon looking at the statements now I came across the emails they sent me initially stating the above repayments for all items. I also checked my statement and saw that I pay interest fees as well which are very high at one stage it was close to R 500.00 which I could not understand, because I make my payments every month before the due date and they already charged me a facility account fee, finance charges as well as delivery and assemble fees. I didnt do anything about this until today when I came accross my initial emails from Homechoice stating my costs and repayments. Thus far I have been paying an amount of R 1 500.00 every month as opposed to the R 704.00 which I calculated my repayments should be. I need this sorted out asap otherwise I will be forced to go to the consumer protection or ombudsman if no assistance is received from Homechoice.