When the CD unpacked, the playing side was covered in a thick white greasy gunk.
There was little point I complaining as I have a pro CD cleaning machine I thought I'd try first
It took a whole evening of it spinning in cleaning liquid to remove all the white stuff.
It plays fine. So all's well that ends well.
If it hadn't cleaned up, I would have sent it back for a refund
God alone knows what the white greasy stuff was. I'd rather not try to imagine.
The CD is now playable