Varite Network Engineering interview questions

It's a fraud firm. I have wasted my time for 5 rounds of interviews for their Client LinkedIn they wasted somewhere 40 to 50 days for the process and several wanted calls. Hights of "unprofessional behavior" happens when they call me back after a month with the big words, we are releasing an offer, get ready to on board. & again no email no update.! not sure how Brands like LinkedIn & Cisco partner with them. I am writing this for the Jobs seekers, so there can be aware of fraud firm like this and don't waste time.