I may be stating the obvious here, but just in case you don't have any of the following information, hope it is useful !
Residential customers - 0800 545 458 (if you wanted to risk a telephone call !!)
CEO of BT (Ben Verwaayen) [removed by admin]@bt.com (this is several months old, but might be applicable still)
enquiries@otelo.org.uk (last resort perhaps !)
post edited by kitz to protect addy from spam bots