BAD SERVICE AND NO REPSONS

I was handed over to attorneys by Wonga and there I settled my accountant with them and received a paid up letter from them. But when I went onto Wonga website it still showed that I owe them money but I have received a paid up letter from the attorneys and me and the attorneys both send Wonga the proof of the paid up Letter and I have received confirmation that Wonga have received the payment and in the mean while I found out that it still reflects bad on my credit record but it has been paid in full and I don't owe them money but according there system I do and I've have been trying for more than 2 weeks to sort out this matter but with out any luck getting through to Wonga and with no response.