EF (Education First) Activity Leader interview questions

I had two interviews, one with each of the managers. They happened over video chat. Both of them asked the same questions of the script. They didn't reveal the salary information until after I accepted the offer. They offer me a position. After five weeks from me accepting the offer, they messaged me once again and said they decided not to invite me to work with them anyway. I experienced a lot of missed e-mail, lack of clear communication and general organizational chaos.