If you do want to leave, virginmedia let me leave due to congestion. I just spoke with retentions, took at most 10 minutes before they said I was free to go elsewhere.
Once you are diagnosed as a high utilisation area, which is service affecting - and a discount is applied to your account, they can see there is an issue and retentions are UK based.
Without hardly any quibble they let me go, I am now on TalkTalk which touch wood has been max throughput 24/7 & surprisingly the fault I did have was raised at 11PM and fixed at 11AM next day so can't complain too badly about the CS.
The best decision I ever made was to leave VM, it would go too slow to do almost anything and the pings could hit the 100s.
Edited by ukhardy07 (Thu 28-Jan-16 00:47:16)