Sorry to hear of your internet woes with TalkTalk but you would be better off posting in the Broadband or Fibre Broadband (as appropriate to your service) sections of these forums where I am sure a TalkTalk forum OCE will be able to help. Alas you posted your problem in the forum section for issues with Email. Good luck.
My apologies. Am attempting to move the thread that originally came with this post...
Edit: have managed to move the post for the relevant OP:
https://community.talktalk.co.uk/t5/Fibre-Broadband/Awful-internet-service/m-p/2581680#M277259