Absolutley no servce - no call centre response!!

My 10MB line has been a problem since day 1. It eventually worked for a brief period at 9,2mb to 9.7MB sync - now I'm luck if I get 7mb? I have attempted to contact technical support for the last 3 days - but have given up holding after an average of 1 hour 45 minutes a time. Being in networks myself, I would like to point out the issue for you. my SNR is 78 on the line, which is acceptable, but the attenuation is 435!!! This means that the line, port or filter is faulty. Could someone please get this sorted out once and for all - and please phone me, don't just resolve and close the F*&^g call because I am not going away