This promise is a complete scam, I too was persuaded to stay with BT on Halo 3+ and was even told by the salesperson that full fibre would be in our area within 12 months. Nearly 19 months later and it's still not available and now I here on this forum I wouldn't get it for free anyway. What a total rip off. I wonder what they will promise at my next renewal date I'm already getting the VIP treatment emails saying I can continue as I am, (don't make me laugh).
I went with BT because I thought they would be the best now I can't wait to move suppliers...