Nathan's Natural Stole my money Internet, Internet

I purchased Nuvoryn from Nathan's Natural.  They were running a buy 2 get one free special.  They claim the product was 100% gauanteed.  I received the product and started taking the supplement.  The product made my heart race.  I called the customer service number 800-216-3801 and they gave me the address to send back my product to.  I had the post office track my package so that I made sure it was received back by them.  After several weeks passed I called and asked about my refund.  They said it takes 21/2 weeks and I told them it had been that amount of time.  They said someone would contact me with 24 hours either by phone or by email.  Nothing.  I have call now several times and I get the same thing.  I asked to speak to a supervisor and they said all they could do is write a report and send it in.  It has now been more than a month since they received my product back and I have not heard from them.  I have since read all kinds of complaints about them on the internet.  I am now out $99.90.