XIPHIAS Software Technologies Business Development Associate interview questions

First round was the normal introduction round and after that there was a md round which was also a intro round and next day they called me for final round with ceo.I got selected in that round and they told me to join immidiatly and asked me for a original document so i told them to think.Next day hr called me and asked me for joining but i told her to sent my offer letter and then i will think. She told me to sent offer letter but she did'nt. worst experience with this company.