Dispute after 20 days possible?

[serotoninzero]

I've never had to dispute a transaction before, but I realized the company/website I purchased an item from isn't used or moderated. I went to dispute it, wrote a message to the sender despite knowing I wouldn't receive an answer, and mistakenly read that I had to wait 20 days to allow them to respond, not that I had to escalate the case within those 20 days.

So the case auto closed, and now it seems like there's nothing I can do.

Is there anything I can do?

[Whac-A-Mole]

You have 30 days with Ebay and 180 days with Paypal and your cc issuer.

But your case is now closed,and cannot be open again,so if you have used a credit card,file chargeback with your cc issuer.