Did you switch the router off for a full 30 minutes, @Laura1986!?
Do that and then leave the router switched on, plugged in at the test socket, if you have one. They'll run some line tests etc to help diagnose the problem but are not on here before the morning.
See here, to check whether you have a test socket:
https://community.talktalk.co.uk/t5/Articles/Your-guide-to-main-phone-sockets/ta-p/2205432
Please complete your community forum profile details for forum staff to identify your account. Go via your avatar; settings; .....Personal Information. SAVE CHANGES.
Gliwmaeden2, a fellow customer.
