E-bay question

[djkest]

Don't know where else to put this. I have a problem with a seller on E-bay and I'm not sure what to do about it. I know e-bay generally sides with buyers so I'm a little worried. I'm afraid I'm going to get swindled out of they money he promised to pay (and did pay, a month ago).

The facts:
Sold Avatar 3D blu-ray disc new/sealed.

Mailed it out 9/9

Today I got an e-mail from the buyer:

I bought the 3d avatar blueray dvd from you. It dosen't play in 3d mode. The picture freezes on every chapter and is broken up, I think because when reading the disk it only reads 25 hertz. I would like to send it back for a refund. Thank you R***.

This item is practically worthless if it isn't sealed. Wonder if I can get a new disc somehow? Also it could be that he's got equipment problems on his end. Not sure how all the 3D stuff works.