The best thing you can do with this company
If, like me, you're a former customer and want nothing else to do with Talk Talk, send them a section 11 notice and ask them to cease processing your information to send you direct marketing: www.mindmydata.co.uk
If you're an existing customer watch out for special offers as my dad subscribed to a 12 month special offer at half price but it only lasted six months; then they put the price up. I got involved as my dad is in his 80s, and after getting nowhere with their Indian customer services, I contacted their head office and got them to sort it out. Apparently the person who processed the 12 month discount only did it for 6 months and failed to keep a reminder that he needed to put the other six months through. But why didn't he do it for 12 months in the first place and why, after their customer service people kept my dad talking for nearly an hour, did they not discover the error? Why did it take an investigation from head office? I was going to report them to Ofcom but my dad didn't want to get involved.
The other thing to watch out for too... if you contact Talk Talk and ask them to make a change to your account, this will require you to automatically renew your contract with them and they don't necessarily make you aware of this. That's what head office told me.
I'll never do business with Talk Talk again. I switched to Plusnet last year and haven't look back - good speeds no disconnections and excellent UK-based customer service. It's more expensive but it's worth it.