Network Circle interview questions

The interview went quite good, it had 3 rounds. 1st telephonic round with HR 2nd was with technical lead and CEO 3rd round was technical round which included test on machine learning and other general technical topics which was quite easy But the hiring team is not professional. They play with candidates and doesn't give a offer letter at the end I cleared all the rounds and they told they will be giving me offer letter in 1 week but didn't receive any. When I contacted them they asked me to wait. I waited 2 months waiting for them whenever I contacted they didn't responded properly. At last they sent me a rejection email.