Disappointing Customer Service

It is very frustrating to make a payment arragement with Mr Price/ACS and commit to it only to be harressed and charged with over R100 extra costs when payment is made on time. I refuse to be treated like a non paying customer and humbly ask that you pay more attention to how your customers are being treated and make sure that statements are updated accordinly. I hope my issue will be addressed as a matter of ugency and be treated with respect.