Smarter Click interview questions

Interview was held on Zoom. Only 1 round then got offered the role over a week later. I was offered the role, accepted and signed the contract. Had to decline other job offers as I decided to go with Smarter Click thinking they were a great company. Only for the recruiter to call me 1 week before my start date to say they don’t need someone for the role anymore. Not very professional to say the least!