It's supposed to be easy to remove it yourself via My Account, @F8C4Y7MB.
It often doesn't work these days, so contact Talktalk directly:
https://community.talktalk.co.uk/t5/Articles/How-to-contact-TalkTalk-Broadband/ta-p/2230529
Without it, you'll be paying 24p per minute to ordinary landlines and mobiles.
Gliwmaeden2, a fellow customer.
