Has anyone else ever been screwed by eBay ???(as a seller)

[jbute2k2]

Very rarely, if ever do I ever use eBay to sell Blu-rays...But due to certain circumstances I needed about $500 fast so I decided to sell 40 of blu's in a lot on eBay. It sold for just under $400 all of the blu's included were either in MINT condition or still sealed. 3 days after the auction I messaged the buyer as they had still not payed me. They say they forgot and would pay within the hour (it took them 2 more days). They paid on a Friday night...I shipped on the following Tuesday as Monday was President's Day. Everyday from Friday until Tuesday the buyer messaged me telling me to bubble wrap the blu's...I told them don't worry I would package them safely. She then proceeds to write crazy messages saying that she knows blu-rays get scratched during shipping so make sure I package it "extra secure and safe". I complied and did so as that is how I would want my blu's, but why send that message every day?
Well the day buyer got the package she sends me a PayPal invoice for $100 saying the discs were scratched, I know for a fact that is untrue as I checked all of the discs before I packaged them and of the 40 I had only watched 16 of them; the rest either had shrink wrap or just had the shrink wrap removed. Well eBay decided that the buyer has to send the movies back and I have to refund them...basically a huggggeee pain the butt for me. I know eBay has to protect everyone but I am terrified that this person may have deliberately scratched my discs after I refused to give them $100 back for no reason. Long story short if/when I get my blus back (in the condition I originally shipped them in) I will be selling most of them here as I usually do. If the Blu-rays aren't in the condition I sent them in is there anything I can do? Has anyone ran into problems like this on eBay?
It's just a screwy situation and I had to put it up somewhere.