Bad bussiness

Good day

For starters, I have been paying my account every month on the same date with no hassles, I have been calling back and forth trying to solve this matter with RCS since last month with no success. I made 2 payments last month April and up to this date no payment is reflecting meaning the amount is still outstanding to them. I have send proof of payment and also have a follow up email that acknowledge that they received payment and that the funds will be send to the relevant departments for allocation. I am currently still struggling to sort this matter, what am I to do. I do not have money laying around to waste. I need help please.

Kind regards FED UP