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To answer your question ->
Certainly, this issue with your land line with Talktalk, i have managed to find out a way to reach them, see below:
To reach talktalk during this time, as their phone lines are closed, you can post that account concern at their community forum and one of the account reps will email you privately. At this link, click register at the bottom and then create an account and then post the concern as an article - https://community.talktalk.co.uk/
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