BILLING PROBLEMS

I HAVE PAID ALL MY ACCOUNTS BUT THERE IS ONE THAT KEEPS REFLECTING AS UNPAID. I HAVE BEEN SEVERAL TIMES TO THE OFFICES . IT TOOK 1 YEAR TO SORT OUT MOST OF THEM BUT THERE IS STILL 1 OUTSTANDING. NOW IM GETTING THREATENING PRE CUT OFF LETTERS FOR WHICH I AM CHARGED AND I REFUSE TO PAY. HOW MANY TIMES MUST I GO AND SIT IN THE QUE AT THE OFFICE IN SANDTON AND BE TREATED LIKE AN IDIOT AND STILL NOT GET ANY WHERE.<br> THERE IS AN AMOUNT OF 2572.98 REFLECTING AS UNPAID. I HAVE ALWAYS PAID MY ACCOUNTS......I CANNOT GO TO THE OFFICE ANYMORE, THEY ARE RUDE AND ARROGANT AND IM SICK OF IT.