Ebay classifieds, mailed item in wrong size?

I bought something on ebay classified ads for about 60 euro. In the description it was a 15 "laptop, but the article I received was for a 13" laptop. This is also in the inside of the bag. But I'm 100% sure that in the description was 15 ", since I have been looking for weeks for my 15" laptop something. So, unfortunately I can't open the ad anymore. What can I do now or what should I write to the seller. This is the first time that happened to me, so I do not really know what to do. Is there perhaps also a possibility to look at the deleted display again?

Excuse my spelling, I'm in a hurry right now.

The ad is gone. Now you can't do anything except learn from it.

ebay classifieds is intended for pickup. You would notice something like that.

If you are willing to take the risk of transferring money to an unknown person, you should save the ad so that you can later read what you paid for. Whether that would help, is another question.

If you still know the title of the ad, you can search Google for it. With the keyword "15" "you might still see the corresponding part of the ad.

Now you can't do anything anymore, just try to keep selling the part so that your financial loss is as low as possible…