Not recovering Proof of payment

I have been receiving calls every week from the 25/04/2015 and i have been sending the proof of payments from than, still they are not getting it right, <br> emails has been sent to: [Email Removed] [Email Removed] [Email Removed]<br> <br> I have been told that its updated every day but still receive the call the next day, they are not allowing me to speak to the manager of the floor.<br> <br> whats is worrying is that they are charging interest on the account and they are billing me on the phone calls they are making.<br>