They generally don't reply to emails...never answers the phone. Best to go in there in person. If you can't go there in person then keep emailing or sending a letter.
I had no choice but to go in person and then service was good..then in the background I heard the phone ringing and Felix? Didn't even skip a beat in conversation!
If you want the best trolley on the market, then persist with it and good luck!
Oh and Mark C at P S P A sells them or at least can make contact with Gamemasters for you