BT voyager 220v & Netgear WG602v3

Having the absolute horrors trying to get these two to work together. When first setting up broadband connection for some reason the wireless worked fine and my laptop (which had been set up previously with it) recognised it. Then something went drastically wrong. Modem plugged into microfilter/phoneline etc, ethernet cable into router and then again ethernet router in to laptop so that it is all wired up and so that I can configure it to my laptop again. But the broadband won't connect to the computer unless plugged in directly to laptop (i.e. with wireless router abandoned). Have spoken to BT support who say that this is because the Voyager 220v isn't wireless compatible and therefore I can't connect using the Netgear router. I doubt this considering I have seen it working first hand at beginning of setting up and plus, seeing that someone else on forum has been able to. Any ideas, PLEASE, on what I am doing wrong?!