Suppose the only thing to do is get in touch with them again and see what they say or might be the time to cut your losses and move on. Thats what I did 4 or so years ago, bought drives from USA Ebay that gave me nothing but problems, I got a lot of help from John Prentice and in the end managed to get things working but John gave me a loan of a G201 and the difference was night and day. My mill could only get 400mm/min on the eBay drives, on the Gecko it could do 4000mm/min, I ordered some the same day and just resigned myself to the fact that I had wasted a lot of money.
Your situation might be different though as at least you live in the same country and might get some joy from Marchant Dice, hope so.
Hood