Cognizant Senior Software Developer interview questions

Technical round over the phone and face to face discussion on the more on technical again. Then HR meeting to discuss the salary and role. Later they called me back with offer after they finalized me.

Interview process consists of 3 rounds. First is on basic questions on java, spring and second round is advanced on java, spring, hibernate. Final round is HR. After discussion with HR about salary breakup and negotiation on salary package, HR informed me that she will release offer tomorrow. I waited for 2 days. 2nd day i got a call from HR and she said that, "Having problem in releasing offer letter". I was shocked and want to know what was the cause. She replied me that they are not able to provide the package that i am drawing. This is second time, offer letter wasn't release for me. If these companies not able to provide the package atleast the person that he is drawing then why these people unnecessarily waste time of us. Even though i selected in both technical rounds, they haven't released offer.