EBay Returns

Hi. So I ordered an item on eBay and the seller said they had to leave the country and would be a delay posting it. So I asked for a return and submitted an accidental order. The seller refused this so I wanted for the delivery date and beyond and tracking still says not delivered. When I contacted eBay because I all ready did a return I can’t now submit an item not delivered according to them and they say there’s nothing I can do? Is this right?

I’m trying a chargeback but seems crazy as all the tracking for the item is on eBay and there’s evidence there he hasn’t posted it and I haven’t received it but the won’t help me due to the earlier accidental order return request.

Is chargeback my only option?