Dishonourable service

Good day. I have had a loan taken out over 2 years ago. I have paid my loan on time every month, it is via a debit order. My last payment should have been in April. RCS system had a glitch and had the incorrect amount taken off end of March and in April nothing. My account was then handed to collections and bad payment against my name. This was not my doing, their sysyem had a glitch. The account has since been settled but I am still waiting for a Manager to call back. A month later