An 'Erroneous Transfer'

Well, that's their opinion!
I recently transfered from Southern/Ebico to EDF for supply of both gas and electricity.
I had looked at another site, I won't name them as any free publicity is not worthy.
So, this un-named supplier (BG) think they have my gas account; think again, no readings have been supplied, no DD set up.
EDF are doing their best to resolve the matter but BG are blowing hot air.
I have an email from the regulator which may cause financial problems for someone.
Ongoing...