This over Wi-fi or Ethernet?
Below are some standard things you can and probably have done before calling the team.
Have you done a factory reset to the router indicated in the link below?https://help.nowtv.com/article/improve-broadband-speed
This link also shows any planned outages as well wide spread faults.
You need to call the broadband team. See link for number.
Yes, I’m experiencing rather poor download as well - sometimes pages won’t load at all. To be fair, up to six people are connected simultaneously but mostly just browsing rather than streaming. Any suggestions on how to improve the signal?
Try splitting the bands which is indicated in the first link of my post.
And please do be sure to let us know what improvements you see from this!