RCS is a not a trust worthy company

The worst campany ever. I made payment last year December with the details they provided, they call to say they did not receive they I need to send proof, I send of payment via 3 different email addresses they gave me and on their whatsapp number, they advised they did not receive the roof of payment. I than re send it again while the agent is on the call, the agent advise she received it. The very same day they call and say they did not receive the payment nor the emails. They don't have a system they working from they don't make notes, there is no complaints department to lay a complaint, they call me 4-5 times a day and cant see that I spoke to an agent the same day or previous day. I explain the same thing over and over I'm fed up with RCS and they affected my credit score, I did not miss a payment I make payments monthly yet they still call me and tell me no one spoke to me but someone just called I ask wheres the notes someone just called... No notes no emails and no proof of payments I would like to know what is the way forward to clear my credit score with RCS they are the worst csmpany I am sick and tired of how they deal/dealt with, they are horrible messed up and they fail to do things... No complaints team. It's a big concern how can you trust a company like this. I want my name cleared.