Help with Sprint service!!?

So I switched to sprint and 2 days later I switched to Verizon. I traded in my iPhone7 for the XR at the sprint store. I would either like the iPhone7 back or a refund for it. Sprint customer service is telling me they can’t provide the iPhone7 back and the store is saying they can’t guarantee a refund. I want... show more So I switched to sprint and 2 days later I switched to Verizon. I traded in my iPhone7 for the XR at the sprint store. I would either like the iPhone7 back or a refund for it. Sprint customer service is telling me they can’t provide the iPhone7 back and the store is saying they can’t guarantee a refund. I want something back somehow. What can be done?!
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