Celire advertised stereo headphones Sennheiser RS 220 for $50 dollars, sent payment for said headphones, never heard from them again, have sent many email and tried calling phone number, but they were never answered and phone is disconnected Houston Texas

I saw an advertisement for stereo headphones on the internet, Sennheiser RS 220, and the email address of this company that I could order them from, Celire.com, I ordered them on May 20, 2015, the only problem is they only accept $50 Playstation Store Gift Card from amazon as payment, it was sent to them, I got an email from them saying they got my payment and I would receive an email from them within 2 business days stating the item I had ordered had been shipped. 

 It is now May 29th, I have not heard from them at all, I have sent 5 emails asking about my order, I have not received an answer ever, and I have called the phone number given on five seperate days and it does'nt work, appears to be disconnected.  I would like my headphones please, or a full refund of $50.00 please