lead someone up the garden path
US /liːd ˈsʌm.wʌn ʌp ðə ˈɡɑːr.dən pæθ/
UK /liːd ˈsʌm.wʌn ʌp ðə ˈɡɑːr.dən pæθ/
1.
to deceive someone or make them believe something that is not true, often to achieve a personal advantage
:
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The salesman tried to lead me up the garden path with promises of a discount that never materialized.
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Don't let him lead you up the garden path; he's known for making false promises.