Hi
Same as me...I had 37/8 until I upgraded now its 32/8. Logged a fault with them since 14/04/12 they are now saying the problem is sorted....I know how you feel trying to speak to someone, they pass you from pillar to post. I have rang them at least 8 times and on some occasions for upto 40 mins!
Rang again today and an engineer visit is booked for Tuesday. Go to BT infinity forums, lots of people are having the same issue.
Hope mine gets sorted on Tuesday.
good luck, just keep on ringing them....
Yeah I'm another person who's line service has actually become worse since the upgrade, I emailed them initially as anytime I call I seem to get somebody from India and they just don't seem to listen in all honestly. Anyway the guy replied and said he did some tests and found a possible fault on my line, he opened a fault with the BT Wholesale team and they listed it as resolved without even contacting me.
I sent another email advising the issue was far from resolved, got a call back this time. He said they never enquired about getting an engineer sent out to my location so it's likely to be something on the exchange end and he opened another fault, I hope they get this sorted soon because my initial 18 month contract was almost up and I renewed for what seems like nothing.