Angry client

I am really angry with the way I’ve been treated. I went to Mr Price Cresta to pay for my account and I was told that my account is not showing I should try somewhere else, I tried different Mr P’s trying to pay until it passed the date I was supposed to pay by. I tried paying online but it bounced, I tried calling with no assistance. Now my credit scored is messed up because of a mistake that isn’t even mine. Last month I went to fourways crossing and thank God the lady there was patient enough to assist me, I made an arrangement to pay and paid the agreed amount but now I check on credit score it’s still showing anothing missed payment. This is really making me angry as I’m trying to build my credit score and this is really setting me back . I never want anything to do with Mr price