Possibly not a scam, @MikeWs34.
Talktalk does sometimes have trouble sending out bills, particularly if you use a Talktalk address.
They will start sending a paper bill [and they charge extra for it] so perhaps change the email address you use to log into My Account etc for billing etc.
Staff will advise further on here [daytime Monday to Friday].
See here for changing the My Account email address:
https://community.talktalk.co.uk/t5/Articles/Change-your-My-Account-email-address/ta-p/2205264
Gliwmaeden2, a fellow customer.
