Try talking to their retention department (they will almost certainly pass you to them if you ring up and say you're intending to cancel) and tell them the package details you need them to match to keep your contract.
Problem is they could just go okay then see you later. Knowing full well that my data for my phone is also reliant upon me having home broadband with them.
Try talking to their retention department (they will almost certainly pass you to them if you ring up and say you're intending to cancel) and tell them the package details you need them to match to keep your contract.