Telkom will change you for service they cannot provide

Recently opted for a downgrade of my Adsl Service from a 20Mb line to 10mb line on the 21st september.Its has gone 3 months and there has been no downgrade active on my account or line.Call the call center from the billing department to the Sales department giving them the reference numbers and still no joy.Im still being charged for a service firstly that i cannot utilize due to me being to far from the Exchange to recieved the dedicated 20mb.Numerous technicians call outs and this final product was i cannot get more then 10mb.But Telkom being Telkom are charging me for a service that is not available which is a ******* .Hope this is a learning Lessons to Everyone out there Fibre services are available rather get a service provider thar will not rip you off.Please can any one assist to take my Matter up further so that many other people will not be **********...