Internet issues

Since 4th July 2015, I have been calling telkom, logging faults as my internet speed drops drastically. I have a 4mb line but for the past 3 months its been syncing at 5mb which is causing hectic issues with my internet. Ive had 3 different technician come out and only to be told they cant find the fault. They test my line on the smartphone and everything says PASS. But at the end of the day im still sitting with Internet issues. I know it's my line that is faulty cause ive tried MWEB data and I still experience the same issue. Ive run of patience with telkom its over 6months I have this issue. Maybe they need to train their technician cause they don't know much they don't even bring equipment to test the lines. Only 1 person can be on wifi at a time (who ever thought a 4mb would be enough and it's uncapped) how ridiculous is that! Not to mention how many tickets have been closed with out anyone even contacting me. I want this problem sorted out.