I sent my phone in for repair on Nov.10th 2017. It...

I sent my phone in for repair on Nov.10th 2017. It is now May 22nd 2018 and I still have not received my phone! In fact my phone is on a different customers account,which means they fixed my phone and either sent it to the wrong person or they sold it to a store as a certified pre owned phone. (I work at Boost mobile and tried to put my esn on another acct to free up a phone for a customer,which is why I have access to the fact that its on another persons account)
They will not send me the $400 that I spent on it. Nor will they even send me another phone. At this point ,since they have had my phone for over 6 months i feel reimbursing me for the phone is the only thing to do. Not to mention the phone is outdated at this point.
Consumers send their phone in with the understanding it will be fixed in a reasonable amount of time. That has not happened!
I did not purchase it from HTC but I did sent it in to their repair center. They did not hold up their end so I deserve my money back.
I have attached proof of purchase along with the receipt and tracking info I got when I sent the phone in. On the receipt I also put the date and time HTC signed for it.