I'm sorry to hear that you're experiencing problems with your service. When you switched the ONT off did you leave it off for at least 30 minutes? If not then can you give this a try and let us know how you get on
If you would like the support team to look into this for you make sure that your personal details including TalkTalk phone number or account number are complete on your community profile (click here) so that they can link your forum identity with your account and then wait for them to respond.
