Hello Carl,
Sadly many businesses are spammed out with email and have given up trying to salvage any gold from the dross. If they have a reply service through their website that will usually get attention, but as has been said, the direct approach is the one to use
Another possible supplier is one I've used with success http://www.metals4U.co.uk with these people you can order on line or by phone and they will cater for smaller orders.
Regards Brian