Onlineguitar.com Never received product and have not received refund Internet

On December 2nd I ordered a cello from onlineguitar.com which they said would take 7 days to arrive. Around the 17th of december when I still did not receive the cello I called the 1-800 number and they said they would track it and email me back. A few days later after receiving no email I called back and they said the product was returned to them broken and would offer me a refund.

When no refund was received I called back and they asked me to email them and they would send me the information for the refund. After a few emails back and forth with no specific information I called back and the manager whom I need to speak is either not there, just left or hasn't came in yet. I have not yet received my refund.