No. You were not cheated.
That offer means you buy two at the regular price and you can take a third for no additional money.
If you buy only one, you pay full price for one.
If you buy only two, you pay full price for two.
Only if you get three do you get "the deal."
It is unfortunate that the three bottles were more than you were allowed to import. Next time drink one bottle at the airport!
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