Sorry for the confusion there @flyer13 - you're able to use the one login on up to 4 devices, however only 1 device, alongside Yes TV by Fetch can be simultaneously watching games.
I am really sorry that you were given the incorrect info, more than happy to feed this back to the agent. At this point in time, what Steph advised is correct though - we're unable to support more than one device connected at the same time along side the Fetch TV.
I can see that you were provided with the incorrect information and I do apologise for this. As advised, I can definitely provide feedback to the representative you chatted with but I'm unable to offer you to stream via 4 devices at once.