Futurism Technologies Software Developer interview questions

it was bad. they took my 4 rounds and told me i am selected. also they told me that they will send me offer letter. i waited a lot but i dint receive any letter. i called them because i wanted to resign from previous company. but they said the position is on hold. after 4 interviews in 15 days they make u feel positive and then they dont select u. The interviewers are oversmart. i will suggest them to interview with the same questions to their senior employees and check their knowledge instead of showing off to the interviewee