FIS Senior Software Engineer interview questions

I have done interview two time in FIS and selected both time, but HR has put profile on hold one time and other time they took all documents, but did not process offer letter. I also trying to connect HR multiple time on email and phone calls, but did not get any reply from them. I would not be recommend to go for interview in FIS. I feel they waste time. I don't know, whey they call peoples for interview, if they don't want to hire. It was really bad experience of process.