Multilingual Books Delivery Problems, No response to telephone/email messages ISeattle, Washington

Contacted this company on Mar 16, 2012, for a copy of Russian for French Speakers (Le Russe sans Peine), book and audio media, published by Assimil in Paris.  The company sent me a thank-you email and charged my credit card almost immediately (Mar 19).     After waiting two weeks with no deliver, contacted them by e-mail - no response.  Contacted them by telephone, and was able to speak to the owner (Ken) after several tries.   He explained that the order had to be shipped from Europe and there might be a delay.    This information was new to me, and was not explained on their web site.  Ken offered to send me the book immediately, and wait for a later shipment for the audio CD.  I accepted this offer.
Book arrived about April 14.  Waited another month, no media.  Contacted them repeatedly by telephone.  Once or twice I was lucky and someone answered the phone, but usually I had to leave voicemail to which I never got a response.  Finally on June 15, contacted Ken again and asked to refund the portion of the order for the audio CD.  Ken agreed and said that a credit would be posted to my account "in a couple of days".  June 26, after no response, contacted them again, got a sales rep, who said he "would look into it" and get back to me "in a few hours".   It is now 24 hours later, no response.

My impression is that these guys are not consciously trying to rip anybody off, but they do seem disorganized, and their failure to respond to multiple voice and text messages is very disconcerting.