Q: If the product purchased is not as advertised and eBay give me a refund due to the seller not responding, what do I do with the product?
الجواب خامدا ومصليا ومسلما ومنه الصدق والصواب
A: It would appear that eBay guarantees the performance of the contracting parties. The refund you have received is from eBay and not the seller. Therefore, you should contact eBay and ask them for advice as to what to do with the phone. If they allow you to keep then you may do so.