If you want to cancel, @Charlotte19851, you are best phoning 03451 720088 as they can process it, whereas, if you use Chat, you have to receive a callback phone call which might not come at a convenient time.
Check first what the minimum guaranteed speed was for your line - I am just on "Fast Broadband" which is up to 16mbps but guaranteed above 6, so your Fibre35 is likely to have a higher guarantee - but again it is line dependent, so you need to check.
If you have received consistently poor speeds and given Talktalk literally months to try every remedy, they are more likely to allow you to leave without early termination fees, but it must be discussed.
Remember that if there are problems with the Openreach line, these are likely to follow you wherever you go.
Another option might be to try to move to Virgin, as it doesn't use the same cables.
You have to tell Talktalk if want to move to Virgin, despite what the assurances on the Virgin site about it all being done for you, and make sure Virgin knows your phone number if you want to keep it.
Gliwmaeden2, a fellow customer.
