Telkom line speed upgrade 48 hour going into week 2

So about a year ago I installed my adsl line, I was told to wait max 2 weeks and it will be done. I phoned every week to find out whats happening, at around week 5 I was told to pay a deposit that's why they never installed my line, apparently they couldn't tell me that when I signed up for a line, so I immediately paid the deposit. I waited another 2 weeks before the line was actually installed. Now a year later I want to upgrade from a 4meg to a 10 meg line, my account has already been upgraded however my line speed is still at 4meg. I have now been waiting a little over a week for the line speed to be upgraded, every time I call I am told another 48 hour however its now been a little over a week and still no 10meg line speed. I feel so frustrated and angry for receiving this bad service as every time I call I am told there is nothing they can do I have to wait another 48 hours and nothing gets done. Telkom please enlighten me as to when my line speed will be fixed or am I going to wait another 7 weeks for that too?