Thank you Mark, no, as yet I haven't tried that number. I was going to see if I got email notification of billing by email first, as it's usually 18th. Shall I wait until Monday to see ?
I haven't looked at the complaints section - didn't want to complain as such, just get clarification that I can cancel the DD.
My Pipex account had not been migrated to TT when I asked for the MAC code, nor when I migrated to a new ISP on Nov 17th which is why I offered to send you my Pipex account number if you were able to use it.
As XRay said, the only communication I've had since getting the MAC code is another letter late November telling me the Pipex account would be migrated to TT accounts in December (no date given).
I'm just anxious to do this properly to avoid any potential problems