So firstly, I have tried to get this sorted over the phone and it got escalated to the backend engineers. They called me once and said the problem has been solved, it has not been solved.

Since the 6th of November (When I had VM broadband installed at my property), I have not been able to access the settings or properly log into my account. 

It presents me with this message on google chrome:

"""

Bad Request

Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.

"""

And this message on the IOS app: "Oops, looks like something's gone wrong on our side. Please try again"

And inspecting the element on both Edge and Google chrome I can see that it sent out a GET and got a error code 400 bad request. I have tried clearing my cookies and logging on however that also hasn't worked. I have a little more control in general on the My VM IOS app than on PC, as I can at least see the "Your package" tab and the service status. Everything breaks when I go into Settings--> Broadband--> Manage Virgin Media Settings. That's when it gives me the error message beginning with "oops".

Any help would be appreciated although I feel this is a deeply technical bug on Virgin Media's side as opposed to the client side.