Welcome to this user forum. @Iamveryannoyed
It does sound like its gone faulty, which seems to happen a lot judging by posts on this forum.
Have you rung the helpdesk and asked for a replacement?
If you cannot wait for that to arrive, then it may be worth getting your own third party router so you can get online again.
They are not expensive and readily available, and woul enable you to prove the fault.
I would check your phone line first.
Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.
I didn't realise I could just ask for a replacement, although I thought it was implied when I tried to tell them that sending an engineer wouldn't help. When the management ring me I will just straight request one
@Iamveryannoyed See my last message about checking your phone line first.
BT may not ask to visit unless they think its a line fault.
that deals with any charging, so its important to check thing first.