I had a similar experience a few years ago when TT cut me off prematurely. They couldn't reverse the process which left me without a phone line as well as no internet. Ever since then I've campaigned against TT and their incompetent service. Recently my next door neighbour migrated to Plusnet and forgot to change her email domain and of course lost the lot!
Moral of the story - if you migrate sort out email accounts before you move.