No service delivery

I have reported the same fault on my telkom adsl line 3 times this year and still my problem is not solved. The technicians comes to my home and tells me to do this and that and after monitoring the line for a week with the recommended changes i still do not get any satisfaction. My latency is constantly over 700 which brings my dowload speed down to below 1mb and I am paying for a 4mb uncapped line. At the moment you are just waisting my money as I can not use my internet or the streaming service I am paying for as well. This happens everytime telkom does any kind of upgrades but their are no upgrades in our area so i do not understand why this problem keeps on happening. I have changed routers, network cables, phone line cables, splitter boxes and still no satisfaction. This is pathetic service.