Yes threaten to cancel BUT do be aware they can call your bluff and cancel it,this has happened to us, I had to ring back and say that DP hadn't spoken to me about it and can I cancel the termination. (MSE members are ringing in their droves apparently trying to 'cancel' and sky have wisened up to it)
Before that we were getting half price for 3 months quite regularly, I think they cottoned on to our game .
I rang the other day asking for 3 months half price on the movie channels. I got it. It's only after reading (on MSE) someone else had an offer thorugh their door. I told the sales person that the flyer had been laying around for a few weeks as I meant to ring them but DP threw the flyer away so I have no promotional code.
Yes I have just put in a request to cancel my vigin account to move to sky, this was a genuine request and we have set up an install date with sky, when I phoned to cancel virgin didn't offer anything. However we also contacted Bt to change our line back to them. I got a call from vigin yesterday asking why we were moving these services and offering us a free V+ box, a new box for multi room , free uk calls at any time, 25% off international and mobile calls, the largest tv package, 2Mg broadband and line rental for £42 a month for life (that undercut sky by £15 a month!