My club has had similar problems with AMS-flight.

On the 1st of March 2009 we sent a wire transfer to AMS for the
purchase of canopy gas struts for a modification to our DG-505 and for
a tail skid for the club's LS4.

After waiting for over a year and receiving no response from Ales at
AMS, I involved the Canadian representative for AMS, who communicated
with Ales, he agreed to refund the money for the tail skid, (as after
a year of waiting we sourced another) and send the gas struts for the
505.

It is now Oct 2010 - 18 months later, and we still do not have the
parts or the money refunded.

As of about April or May, even his Canadian distributor was not
getting answers to any email inquiries.

The moral here - If you need parts from AMS - don't send them money
until you get your parts.

I would be happy to provide details in support of some sort of action
against AMS.