Business refusal to return personal property?

Just over a year ago I sent a musical instrument (trumpet) to be restored by a company in Tennessee. I paid in full in advance. In January of this year I was contacted and told that my trumpet was being completed and that I needed to submit an additional $70 to cover return shipping (a totally outrageous fee, but that's another story). Anyway I paid that. At that time they said the horn would be shipped no later than 45 business days (that fell on St. Patrick's Day). Anyway, no horn, no contact, no response from my attempts to contact. Finally BS stories about why they couldn't finish my horn. To make a long story short, contacted law enforcement and received no help. Company refuses to return my horn until they complete the work they were originally paid to do. It seems they perform existing repairs from the money they collect from new customers. People often wait 2 years (or more) for horns to be returned. Can I hire a Tennessee attorney to secure a Writ of Replevin, have it executed, recover my horn and send it to me without first having to go to Tennessee. Secondly, can the attorney file suit on my behalf for recovery of the money I paid them, plus the money I have spent on the recovery process?