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Hi @danmitgina,
Welcome to the community.
I am sorry to hear about your experience with your Sony Mobile product.
To get a proof of purchase your best point of contact will be the retailer you purchased it from. I recommend you contact Amazon to see if they can provide this to you.
That is needed differs from region to region but in general the proof of purchase should contain the date of purchase, the amount you paid, the IMEI serial number, and the name of the retailer.