As many of you know, the Three.co.uk website do not offer anything but a generic telephone number and online query request.
I have been scouring the net for direct email addresses and telephone numbers and have come up with the following results for a selection of forums and sites
I have recieved a call from Glasgow from this number which may be worth trying: 07533 336759 although it was a call for an upgrade so not sure.
I haven't tried and tested any of these so use them at your discretion
executive.office@three.co.uk: Although I'm guessing you'll get an automated response from here.
08707 330295: Seems to be a number that directs you to the Glasgow Customer Service Center
Allan.McLuckie@three.co.uk: A recent forum post suggested this as a successful contact (director of Customer Services). Make sure you have a valid reason for contacting him and all the relevent details.
The following landline/free numbers have been obtained from Say No To 0870:
01442 456195/0800 3586795 (freephone) - Customer Services Straight to the Operator
01628 765000 - Head Office (Maidenhead Switchboard)