I was with PlusNet before which runs on the same BT network and never had a problem, I cannot see why and how you could get it so wrong.
So why change?
One of life's great mysteries to me is why people have to continually change provider for everything. In over forty years as a householder, I have never changed phone supplier, broadband supplier, electricity supplier, heating oil supplier, bank account or anything else. All this chasing around to save a few pennies causes nothing but hassle. If things are working, leave them alone.
Please keep it friendly and on topic.
@fraggy I'm sorry about the problems with your BT service, if you need any assistance with this please use the 'contact the mods' link in my forum profile to send in your details. You can find the link by clicking on my username.