I think you must be using the same internet suppliers as we do at work.
...in which case the problem will never be fixed, until you´ve given the stupid twits a million chances to fix it and after one year in agony YOU FINALLY REALISE THEY DON´T GIVE A CRAP ABOUT YOUR PROBLEM AND THE ONLY WAY TO SOLVE IT IS TO FIND ANOTHER SUPPLIER!!!

*glances suspiciously at coffee cup*
Erm...
Or something of the kind.
;o)