Hi it was the retailers has they paid for it

Hi I purchased a mobile 5g mobile from wish and the phone exploded in my hand and I sent the phone back via parcel shop and the company what picked the item up was Hermes I got a card saying it was a recepit I contacted hermes about the delay in order they told me that the parcel was lost at the national sorting and I contacted the retailer and they told me they couldn't give me a refund has Hermes has lost my my parcel and know Hermes isn't taking responsibility for this issue so what I do to get a refund of these jokers