• Marriott ended its partnership with Sonder, leaving guests with canceled reservations. • Travelers face refund delays and confusion after Sonder's abrupt shutdown and bankruptcy filing. • An expert advises filing credit card chargebacks quickly to get refunds.

Marriott-Sonder guests are describing chaos, confusion, and out-of-pocket expenses after Sonder — a short-term rental company once billed as an Airbnb rival — abruptly shut down this week.

Sonder, which said it will file for Chapter 7 bankruptcy after Marriott terminated its partnership on Sunday, had been operating thousands of apartment-style units around the world through Marriott's Bonvoy platform.

The sudden breakup has left some guests with canceled reservations and uncertainty about when they'll see their money again.

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