For anyone who’s interested
02037436947 is the number for the outbound retention team. They have two teams, one based in Glasgow which is the team who rang me and they where very helpful and there is one based in Swansea. These are the teams who ring you after you have gone through the full cancellation process and will probably make you better offers. I would suggest like
@silverdale said and fully cancel and wait for them to phone you or except their initial offers before you cancel if you are happy with them. Either way it is down to your own personal preference. Good luck.