sweetie so sorry to hear it - but dont panic - there are several things you can do.
1 - Simply not pay, leave some revoulting feedback while you are at it. You will probably incur a neg of your own, but still an option
2 - email ebay with your concerns - you can site examples of fake pigments from various threads here, there are tons of them, and this pigment is very clearly fake
3 - REPORT to ebay the seller having sold you counterfeit goods
4 - open a dispute with paypal and escalate to a claim immediately citing why you believe its a fake and you will get a refund fairly quickly.
Some of the points you can cite are these -
- firstly there is no such colour (nor has there ever been) as Blue71 - ebay can check with MAC themselves so invite them to do so
- second the base of the jar is revoultingly thick - this is NOT an authentic MAC jar
- thirdly Blue was a pro colour which has been discontinued, its sometimes found on ebay, but never in numbers like this seller has had and this colour is definitely WRONG
- fourth the print on the front of the box is WRONG - there should be a space between NET WT (not NETWT), there should also be sapces between POIDS NET 7.5g (not POIDSNET7.5g) and there should also be spaces between .26 US OZ (not .26USOZ) these are ALL fuck ups in counterfeit printing and MAC dont sell "seconds" so they cant use the mistakes as an excuse either.
Hopefully you will get your refunf fairly quickly - make sure you leave them neg feedback anyway!!!