Telkom useless as usual

I have had my 10Mbps ADSL line for a few months now. I have been charged strange charges amounting to more than the agreed contract price and I have not been receiving the service I have been paying for. My 10mbps ADSL line currently operates at 0.38mbps! The landline itself has NO dial tone and after being promised that a technician would be around last week, I have yet to see someone actually show up. I sent a mail to cancel the subscription and am also being ignored. I can't call the call center as no one answers and wasting time on my mobile number is just pushing me over the edge. They have even taken to deleting my posts on the Facebook page when i post the results of speed tests on their page to keep their other customers in the dark.