South City Projects interview questions

I was interview by the DGM-operations first there after it was with DGM-PR and Events.After that there was a gap of 2 weeks then again I was called and I was stunned to see their unprofessional-ism when I heard that they have lost my resume. I was again asked to fill up the details and I had a 1-1 interview with HR head. There after salary negotiation took place for another 1 month and the outcome was they offered me a salary less than my last job but they promised a tremendous hike after 2 mnths. But you wont believe even after 2 months I didn't receive any appointment letter /offer letter and I was still working.