Continuous billing of canceled account

I have canceled my WIFI in April 2015. In May I went into a walk in office. Your offices in N1 city and there was nothing on their systems about the cancellation. In June I went into the N1 branch again to find out how far they are with the cancellation just to find that nothing has been done. Not once did one of their consultants tell me that the cancellation fee would be the outstanding months of contract. <br> <br> I received letters of demand from a Mr Joshua and faxed him twice to resolve the matter. Not once did he tell me about the cancellation fee that could be very high. If I knew that it would be that high I would have changed my mind and kept the contract. <br> <br> I now received a bill of R15133.75. If I struggled to pay R 899 where am I going to the above amount.<br> <br> I appeal to you to please look into this matter. If the amount cannot be reduced I would appeal to reverse the cancellation. I would rather try and pay R 899 for the service instead of paying R 15 133.75 for nothing. <br> <br> Hope you can be of help.