Sprint review: sprint's cut your bill in half program. sprint stole my prior cell phone!!!

I tried Sprint's cut you bill in half program which had a 14 day trial period. I turned in my Verizon phone a Galaxy 5 and Sprint was to payoff the amount owed on my Verizon cell phone ($399) and I leased a new Sprint phone. I had problems with their service dropping calls during the 14 day trial period and so I returned the new Sprint cell phone back to them and paid them the amount I owed for service during the trial period. I asked for my Galaxy 5 phone back and was told it was sent to a warehouse and they would try and get it back. They told me they found in it the warehouse and would send it back to me. Well, after 3 months I still have not received it back and now they say they cannot find it and I am getting the go around between the Sprint store and their customer care department. Neither are getting the problem resolved by reimbursing me for the $399 that I had to pay to Verizon. In essence Sprint stole my Verizon cell phone from me! This happened at the Sprint store at 8460 Farm Road in Las Vegas, NV. [protected] on September 8, 2015, it is still not resolved. I have spent hours and hours on the phone with Sprint without any resolution.