I've spoken/overheard people say this a few times recently. Typically they have moved into a new build and claim that they have no choice of provider other than BT. Surely this isn't true? They have to use a service provided over openreach infrastructure but there are several alternative providers available.
If this is a common false impression that people are getting I don't think Ofcom would be too amused.
---
Andrue Cope
Brackley, UK