We will never know the terms of contracts between Virgin Media and their suppliers in terms of payments, penalties for breaches or even cancellations. No doubt a lot of funds will already have changed hands for the kit to be installed. Going else where may not be an easy or even practical option. There may be no other supplier whos kit could just be "slotted in"
Anyway this is all

for a thread, started by a spammer,that is supposed to be about whether VM is the best ISP. There are plenty of other threads where your BSR issues are more valid discussion. It's time for us both to move on please.