Bought a Birkin bag on e-bay which was listed as authentic by seller. When I received it I was not really happy with quality but stupidly sent a positive feedback as i thought you had to acknowledge goods right away.On examining bag and comparing with genuine pictures on e-bay and other sites I can see it is a fake. E-mailed seller to say it was not as advertised but she did not reply. have gone into dispute with pay pal but seller is not responding to their e-mail. What do I do next? any suggestions would be most helpful. It's the first thing I have bought on e-bay and feel really ripped off.