Pegasus InfoCorp Full Stack Developer interview questions

I was selected in the first round than was immediately given an offer. Because of this I even rejected my existing offer. After accepting the offer I was again interviewed same day with the client and the interview went worst he started asking me tough algorithm questions and complex data structure which I was not even prepared for, he even humiliated me at the end and asked me how I got the offer in the first place. But I was still assured by the HR that my review was positive and I will be starting soon, but I really felt so humiliated that I myself rejected my candidature.