I have been with Talk Talk for 10 years and not once have i had a problem i have always had great service both with there broadband and mobile phones.
TALKTALK customer service systems currently down, just spoke with Joan from Pakistan, i believe, and she confirmed their talktalk systems are currently down.
Be very careful. Did you ring them? If not, I believe this could be a scam.
I would agree with Cassandra to be careful, I have been working from home today and had no problems at all with all my Talktalk systems