MediBang interview questions

The interview was good and I promptly received a job offer. However, after accepting the offer and tendering my resignation at my current job Medibang decided to suddenly pull their offer due to "visa concerns". Despite confirming my visa type in the inital interview (Physically pulling it out my wallet and showing it to the interviewer) and confirming they could support my visa before I accepted the job offer. Medibang still turned around and pulled their offer. Not once did they ever try to take responsibility for the really crappy situation they put me in and they didn't even apologize. I was really excited to work for this company but the way they handle their business really left a bad taste in my mouth. For anyone applying for this company my only advice would be don't take them at their word and make sure you have everything in writing becuase they don't seem very proffessional.