If you go to the Service Centre what does it show for your 'estimated speed' and 'measured speed'.
It would be worth going to the Service Centre to do a test on your phone line, this will indicate if there is currently a fault on your line. You can also access this from the ‘My Account’ site.
Also, if you have a landline phone can you check to see if that is working normally (i.e. you have a clear dial tone and no noise on the line).
For one of the TalkTalk staff on this community to be able to look into this you will need to update your community profile to include your name, landline telephone number that your TalkTalk service is provided on & an alternative contact number. This will allow them to identify you, and they will then be able to help.
Don't post any personal details in this thread, just add them to your community profile.
Then they will hopefully be able to respond to this post within a working day or two.
If you still need assistance can you please update your community profile to include your:
We'll then look into this further. Please do not post this information on this thread. Once you've updated your profile please post in your topic to confirm it's updated.