seller ships after refund know wants paid

Description

I made purchase April 3 and opened a case in the Resolution Center on April 15 and was refunded by Paypal on April 21, here is the Shipment Tracking: May 9, 2020 1:02pm DELIVERED IN/AT MAILBOX MC KEES ROCKS, PA 15136 May 9, 2020 7:10am OUT FOR DELIVERY MC KEES ROCKS, PA 15136 May 9, 2020 2:05am ARRIVAL AT UNIT MC KEES ROCKS, PA 15136 May 9, 2020 12:50am ACCEPTANCE AT DESTINATION MC KEES ROCKS, PA 15136 May 6, 2020 5:30pm ARRIVED SHIP PTNR SITE USPS AWAITS ITEM GREENWOOD, IN 46143 May 6, 2020 5:05pm DEPART SHIP PTNR SITE USPS AWAITS ITEM GREENWOOD, IN 46143 May 6, 2020 2:49pm ARRIVED SHIP PTNR SITE USPS AWAITS ITEM GREENWOOD, IN 46143 May 2, 2020 2:01am DEPART SHIP PTNR SITE USPS AWAITS ITEM LOS ANGELES, CA 90040 May 2, 2020 1:30am ARRIVED SHIP PTNR SITE USPS AWAITS ITEM LOS ANGELES, CA 90040 May 1, 2020 11:30am PRE-SHIPMENT INFO SENT USPS AWAITS ITEM MC KEES ROCKS, PA 15136 Apr 30, 2020 10:07pm ARRIVED SHIP PTNR SITE USPS AWAITS ITEM LOS ANGELES, CA 90040 Apr 15, 2020 3:10am Picked Up by Shipping Partner, USPS Awaiting Item ONTARIO, CA 91761 Apr 16, 2020 5:12am Tracking number provided It was delivered on May 9, I emailed seller asking where to ship it back to, they replied that I must pay and that Paypal is on there side because tracking shows delivered. What can I do? I do not want to be charged for these items, I just want to send them back. I can not use the item since I purchased one from another person and plus the item is defective.