Cognizant — didn't released offer letter yet.

I was interviewed with cognizant pune on 19th may 2018. It was a whole day process. My hr round happened at 9:pm. I cleared all rounds and hr told me you will receive your offer letter in 10 working days. Its being more than 2 months now but didn't got any offer from them. I tried to contact hr but didn't got any reply. So i left hopes. Again after few days in the month of may and june i got calls from hr team asking are you looking for job change? I told them whole scenario he told you will get your offer letter it is in process but when? Again i mailed to hr but no response. Again i received a call on 24th july asking are you looking for job change? I again explained what exactly happened with me. He told there are 10 more people with you having same problem as you your offer letters are in process and respected hr will contact you within 2 days. After 1 week i mailed hr again no reply. I don't know what's is going on if they are having opportunities then why not releasing offer letters of selected people not even not replying. Is there any 1 here who interviewed at same day and location and didn't got offer yet?