CGI Developer interview questions

Was called on a Saturday for the interview. Had two rounds of interview. Both technical. Was told that I cleared both and will have a HR discussion next week. Did not hear from them for a month. After a month a different recruiter called me and asked me if I would be available for a coding round; to which I accepted. A 6 hour long coding interview took place. Passed the round and was offered a first draft of the offer. I negotiated a higher salary to which they accepted. Two weeks passed by since then. I sent a follow up mail to which they responded "Please look for other opportunities." What the hell!