Raspberry Ketone Breeze did not return my money after i followed the rules and cannot get in touch with them, Internet

I ordered Ketone Breeze and returned it the same day i got it, i paid shipping as agreed and extra to post office to make sure that it was received and cancelled. Received email confirmation. Said money would be returned on Dec. credit card report.I have called4 times  each month that i receive my statement and i am told that everything was done correctly and the payment will be refunded $179.90 .I have not received it and now when I call i get a busy signal or after two rings i get silence. I see that I am not the only one that has a problem with this company, what cani do?