Same here. I cannot agree more as this is what I encountered with them as well.
Your lucky. We moved, took residental line with us coupled with our business broadband. It took me a full week to log on. In the meantime someone emptied our business bank account which I wanted to check whilst all this was happening. Then the bill came in for the broadband. £400.00!! It transpired BT had given us 2 broadband accounts on a single line, hence why we had so many BT issued user names and passwords to log on when we moved.. 5 months later I have switched the business broadband to residental as Residential does not talk to Business, and visa versa re accounts. I have a feeling that I now have a residential package with broadband, plus a business broadband. I am dreading the bills and phone calls.