Intermittend ADSL line for the last 3-4 months.

Had a new line installed ***), speed has never been consistent. I had several technicians from Telkom at my house to try and sort the issue. My SNR is very low therefor my line keeps on dropping as it tries to synchronize at a stable speed. Each time a new technician is dispatched they first go to the exchange before contacting the client. They then reset my port or do something at the exchange and my SNR goes back to normal. The problem is during the night or with bad weather the SNR goes down and my line drops and it stays that way. Back to same issue.<br> <br> This has been going on for the last 3-4 months. <br> <br> Please assist.