Would like some advice on where ot go from here.

Bought an item 22 March 2020

Estimated delivery of 26/27 March 2020

Waited.

Item didn't arrive.

Waited  longer.

Sent seller a message 07 April 2020

No response from Seller

Open a request with the seller 09 April 2020

No response from Seller

Requested ebay get invovled 17 April 2020

Ebay refuned my item in full 20 April 2020

Item arrived the afternoon of 20 April 2020, post marked 09 April 2020.

How do I contact ebay to arrange payment for the item?

Cheers