How to resolve open ebay case

[mdasrah_15]

Good afternoon all,

I have sold an item and due to a delay in delivery customer opened a case on ebay. Now he received the item and acknowledged it. However, in order tracking it's still in dispatched status.

Despite multiple requests, he is not closing the case whereas I am getting notifications from ebay to sort it out by Tuesday. How to resolve it? 

Thanks in advance !

[plum993]

Did you post using postal tracking, if yes did you add the tracking details into the order details when you posted the item so ebay can view it.