Good luck.
I had problems that could only be solved by BT wholesale and it was a total riot trying to get it done. Basically BT's records said I was connected to an exchange 13 miles away rather than the one I was connected to which was about 1 mile away. This meant I couldn't join another internet provider (I was with BT at the time).
Some googling uncovered the nature of the problem and the solution but dozens of calls to various BT call centres where I gave them the exact solution to my problem, yielded no results at all despite promises that they had done it.
in the end I found a provider that was able to switch my service without relying on the exchange issue and eventually it sorted itself out behind the scenes about 6 months later but trying to get BT wholesale to do anything was nigh on impossible.