my 10mbp/s line has not given me more than 3mbp/s!

I have been paying for a 10mbps line from Telkom for the last 2 years. THe most i have ever received is 5mbps. Most of the time, i barely get 3mbps. I'm currently downloading at less than 2mbp/s. This is pure *******! i want a refund from Telkom for charging me for something they never deliver. How can they sell a 10mbps line when they cant provide it? I have had over 10 visits from telkom technicians and over 40 phone calls but no resolution. they blame my isp, my modem, my other phones, the rain and everyone else that works at Telkom. Surely we should all get together and take Telkom to court for their blatant thievery!