telkom not taking responsibility

Telkom lines ****** from my area. Telkom sent out comms to say they going to provide a solution but in the same time sent my isp a notification to cancel my line which I have in mail. I got my adsl working again for a week but telkoms line cancel had taken effect the same week causing me to lose my internet and cool . THis issue is ongoing for over 4 months now. Telkom never accepts that they at fault. Current situation now is that my line is on 2mb. My line was originally on 1 mb but I have had it so long telkom bumped it up to 4mb but the cost to me as a end user was still for that of a 2mb. Now telkom even though they cancelled my line incorrectly are saying I should contact my isp because they set me up with a 2mb line. My issue is not that my isp is providing me with 2mb dsl speed. My issue is that before telkom made their mistake I had a 4mb line and now that they have fixed their mistake I have a 2 mb line and they want me to take this up with my isp which will mean that I need to pay more for something I already have and am supposed to have.