Not for streaming issues. But you can contact Live Chat:-
Avoid ‘Get Help Quickly’ on this screen. This leads only to the Nowbot, an AI bot that might well assist you in navigating the Help; but if you have reached this state of affairs, you have already gone well beyond that, and all the Nowbot can bring you is frustration.
There’a phone number if you have an issue with Now Broadband though, which you should be able to find in the ebumf that comes with it, if you have that.