Telkom fixing a problem and say it is fixed but still same problem exists.

I am having a mega dose of internet dropouts on my ADSL line. Had my ISP do some tests and they have a whole list of "lost carrier" ADSL disconnects. There is also a lot of noise on the telephone line and when somebody phones to my Telkom landline the internet also drops out, and I have a line filter installed. This problem is going on for many months now, had Telkom technicians to check everything but the problem does not get fixed. I also bought a new modem/router and still getting the same internet dropouts, as much as 10 to more than 20 a day and some connections lasting a few seconds at a time. This is really annoying now and starting to lose confidence in Telkom. Can the technicians change my cable between the telephone pole and exchange as there is a lot of noise on the telephone line which could also indicate water damage to the telephone cable. There is no problem with the cable from the telephone pole to the telephone and modem/router. That has been checked many times and fixed even though it was not broken.