Unable to resolve technical issue

For months i have had the problem of my internet connection disconnecting constantly every 20 mins..<br> <br> steps ive taken to resolve the problem on my own :<br> 1) contacted adsl technical several times in which the reset my port and tell me the line is synchronizing , problem still persists.<br> 2) gotten 2 different technicians out to the site which tell me the probelm is my ISP since my telephone works just fine , probelm still persists.<br> 3) replaced my router , problem still persists..<br> 4) changed my ISP to afrihost since i thought the probelm was with telkom , and still the connection still disconnects after a few minutes and re starts constantly. <br> <br> My internet connection used to work beautifully but for the last few months its been a nightmare if the problem cant be solved then i will have to cancell my entire subscription since this is a business we rely on telkom for our everyday needs.<br> <br> i have no idea who to phone or what department to speak to because every time i speak to a operator they tell me the line is fine on their side , but it never used to be like this !! Their is obviously something faulty