Sorry to hear of the service issues experienced, it's certainly not the level of service we aim to provide and appreciate you taking the time to raise this via the forums.
It's been a few days since your last post so we're just checking to see if this is still an issue? You also mentioned in an earlier post that there was an engineer visit arranged for today. Has this visit taken place? If so, what did they advise during the visit?
We have these tips available to help with broadband issues:
Engineer has just left. He said that the wiring in the cabinet was a complete mess and hopes that sorting that out will stop the inteference issues. If not he intends to get a new cable put in from the cabinet to the house as the present one is old. The modem is working fine, which tallies with the response I got on here, so for now we have a fix and going forward if the issue re-surfaces we have a plan of action. Fingers crossed, this is the end of the saga.