Dassault Systèmes Senior Java Developer interview questions

Company management is totally rediculous. I am a software developer applied for Java developer position. I went through all the programming / interview rounds. Even after getting the positive feedback, They are not releasing the offer letter. Complete interview process took around 5-6 effective hours of mine in this Covid-19 crucial situation. HR is not even contacting me or not replying on my mails. From some other sources, i got to know that the HR i am trying to contact has left the company and they have lost the data. This was not expected from such a big company. They are wasting the time of candidates. Think twice before applying. such a cheater company.