After the major security breach they are using an 0870 number for contact. While it's possible that this is free from TT phones that's not good enough.

http://www.bbc.co.uk/news/technology-34615692

On what's left of their website thare are plenty of other 0870 numbers. Sorry about mess of copy/paste text. Couldn't work out how to insert the image file that I'd made from a screenshot.

Sales Hotline      0800 049 7802      Mon - Thur  8am  - 10pm
Fri  8am  -   9pm
Sat - Sun  9am  -   8pm
Customer Services
& Technical Support      0870 444 1820
(FREE from your
TalkTalk landline)

or

0203 441 5550
(National rate number)
     


Mon - Sun   24 hours a day

Newline Customer Services      0870 087 5703      Mon - Sun   8am  -   8pm
TalkTalk Mobile      0870 087 8751      Mon - Sun   8am  -   8pm
Cancelling a new order      0870 087 8038      Mon - Sun   8am  -   8pm

Useful Info  covering things like can i get out of my contract,am i entitled to compensation etc etc.

See : http://www.moneysavingexpert.com/news/broadband/2015/10/talktalk-website-hacked-...