Marriott left a young family high and dry in Sin City — literally.

A dad has claimed that he, his wife and their 3-year-old were forced to spend the night sweating in their car after the brand-new Element & AC Hotel Symphony Park refused to honor their reservation — all because he didn’t have a plastic credit card in hand.

“The only reason: I had misplaced my physical plastic credit card,” the furious guest revealed to One Mile at a Time , slamming the chain for stranding them in the Vegas heat.

Instead of a cool Marriott suite, his toddler curled up in the back seat while mm tried to sleep in the passenger seat.

“My young child and wife slept in our vehicle on a hot Las Vegas night while I repeatedly sought help through every official channel,” the Marriott Bonvoy Titanium Elite m

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