Solecomfy Has not refunded me for returned merchandise and refuses to respond. Internet

Purchased from this site in 1/13.  Received merchandise.  It was the wrong size so I returned it.  solecomfy confirmed by email that they had received and restocked the returned merchandise.  They claimed they had tried to refund to my credit card but that it was expired (which it was not).  I asked them for a phone number so I could tell them the correct credit card number.  They did not respond.  I asked them to mail me a check for the refund.  They did not respond.  As of three months later they still refuse to respond to my emails.  Their website has no address, phone number, customer service, etc.