Did they officially give you a different one or is it that if you dial 17070 you find the number that is read back is not what you were told?
If it's a crossed wire then it's a fault you need to report immediately, @GTWIS.
Staff are not on here before Monday.
Use the contact details for phone / Chat in this link:
https://community.talktalk.co.uk/t5/Articles/How-to-contact-TalkTalk-Broadband/ta-p/2230529
Gliwmaeden2, a fellow customer.
