Telkom *****ing my money

Requested 10mbps adsl line to be installed, when technician came to do installation he informed me that he can not do the installation because 10mbps is not availble in my area. He left without doing installation. Two weeks later Telkom phones me and says that the order had been cancelled due to unavailablelity but that they can install a 4 mbps line for me.I agreed. Problem is that Telkom has been debitting my account for a 10 mbps and 4 mbps line. Have send hours on the phone with them...several reference numbers but no one is solving the problem. Telkom can not expect me to pay for adsl that was never installed.