I have finally given up with trying to upgrade and have moved elsewhere.

You might get a good deal initially but good luck if you ever want to upgrade to a reasonable deal.

Ive never known such terrible customer service or felt like I'm just going around and around in circles. Chat is terrible and takes ages only to get to the point where you need a callback. That doesn't happen for days and then they can't offer you that deal now or communicate clearly without having to ask them to repeat what they are trying to say! Try to offer you a poorer deal and downgraded phone. Absolutely horrendous experience. I will never return.