Proventeq Software Engineer interview questions

Interview was divided into 3 rounds, technical +analytical test, technical interview, techno managerial round. After all the rounds HR spoke to me regarding the package and on call she gave confirmation, took all my government documents, payslips and offer letters from the previous employers and also promised me about the offer letter that she is going to mail me within a day. Later she didn't get back and when I called them after 3 days she said the selection was cancelled.