KritiKal Solutions Software Engineer Computer Vision interview questions

******Fraud Alert******** Don't respond to any call from Kritikal Solutions. This is a fraud company. last month I gave interview there were two rounds I cracked both of them. They asked all machine learning and deep learning question. After that HR round happened and they were ready to offer my salary which I was expecting. Then after 1 week HR called me and asked to drop resignation then confirm the joining date. They told your offer letter is ready just the date we have to give. Then I waited 2 weeks for offer letter after dropping resignation in TCS. Now they are saying position has been filled we regret to inform you that we can not provide you offer letter. This is the ethics which they are following. Now I lost my previous job also and have no offer letter in my hand.