Assurant will not send replacement. T-Mobile is no help

Almost same situation with me except I personally never received the delivery from UPS, although they said it was delivered.  Assurant filed a claim with UPS because I was informed by UPS that the company sending the device had to file the claim.  Two months later I am still fighting to have another replacement sent to me or cancel the claim and have my deductible refunded.  They will not do it because the replacement phone had already been sent.  As of today, June 22, 2024, I am fighting to have my account credited back of almost $400.00 for not returning the damaged device.  I refuse to send the damaged phone back until I have a new replacement.  I curse Sprint for signing on that dotted line.