Happened to me to. Was on BT Infinity,getting around 25 Mb/s. Got email, saying that BT infinity 2 was available. They "upgraded" me ... only to get an email saying the speed was *exactly* the same email that I got when I took out BT Infinity 1! i.e. .... Speeds around 23 - 28 Mbps (supposed to be up to 38 Mbps).
That;s like me saying to my boss .... I know you said you'd pay me for 38 hours of work, I think I'll only work between 23-28 hours a week. I'm sure he would be delighted ... not!