I've recently switched from BT to Orange. On BT I got a sync speed between 4800-5400Kbps on ADSL2+. When I first switched to Orange, this was also the case, but after just one week of being with them, my sync speed started dropping. I've tried to phone customer services, but they are just useless, and I have no idea how to escalate it to someone who won't keep asking 'are you connected wirelessly', or saying 'that is the maximum speed you can get'.
For reference, I can now only connect at 1800Kbps on ADSL2 or 2+. If I force to connect on plain old ADSL, I can get 2272Kbps.
I've tried many different routers (well modems) to try and fix this, and the one I am currently using is the same one I used with BT.
Line attenuation: 47db (this is normally 51db)
Noise margin: 8.2db
If anyone has any ideas what I can do to get back up to what I was on before, I'd love them forever!