Terrible customer service Edgars

I have been harassed for the last three months by Edgars/RCS for supposed arrears on my account - no one could tell me where the arrears came from as I never skip a payment. Upon investigation, they have not allocated three of my payments that I have made to them. I have sent numerous emails with proof of payment, traces from the bank, they have even confirmed in writing they have received the payments but to date, the money still hasn't been allocated to my account. I keep getting empty promises, 48 hour turn around time and it is impossible having all the proof and no one can allocate payment to an account. How difficult is this? After another lengthy call where I had to hold for 40 mins, the matter is still not resolved, once again escalated and now have to wait 7 working days before I can follow up again. The worst customer service I have ever come across in my life. Seriously need to work on this Edgars/RCS - really pathetic!