check your Paypal account and see if there is any email in regards to chargeback. It is not unusual that buyer lost the case and go to his cc issuer to file a chargeback andwin,if so,you will also be socked with a $20 charge back fee. but review your sellerr protection ,you shipped the phone to address given by PAypal and tracking shows delivered,you should get Paypal protection. if you still have the Paypal payment notice email,see if it said you qualify for seller protection and you must ship to the address in that email,elselook up the transaction in your paYPAL account,insist Paypal eats the loss if you qualify for seller protection.
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