lead sb up the garden path

lead sb up the garden path (US: lead sb down the garden path) (to deceive someone) — водить за нос, морочить голову, заниматься очковтирательством

EXAMPLE 1: We were led up the garden path about the cost of the building work — it turned out really expensive.(CIDI)
EXAMPLE 2: It seems as if we've been led up the garden path about the position of our hotel — it's miles from the beach!(СALD)

see also
[pull sb's leg]
[yank one's chain]