Cognizant Technology Solutions — offer letter delay

I have attended interview on apr 27th 2018 and finished my manager round on 21st june 2018. Later hr have asked me to fill candidate form with all details.. I have done it and sent them later i have been updated that it is pending for client approval to process the offer.. But so far no reply and the last update from the hr is "you can try other opportunities as well, if i get any update sure will share with you". I have been frustrated with such response and the process they have. I have spent months with them to complete my interview but at last they just tell me proceed with other opportunities after selecting in the interview process.