Complaint Review: Swiss Sciences

I ordered thhis product online.  When it arrived I discovered that it contained things that I could not take.  They agreed a refund which I expected to be made directly to my card (debit card).  Instead they sent me a check which I could not cash. 

I have spoken to them and they referred me to CC Billiong who handles their card transactions.  I spoke to CC Billing and they referred me back to Swiss Sciences.  Basically they couldn't care less.I tried to ascertain why they would send a check, especially to a non-American customer.  Swiss Science could not tell me.  When I asked the same of CC Billing they said that they never send checks. 

Have you any advice how I can persue this matter?