Reliant Energy interview questions

Experience with Reliant energy was very unplesant. I was interviewed for a Programmer position last month over the phone with a hiring manager. And was told in the same call that they would like to bring me in for a face-2-face. I was happy about that and after a couple days later, the HR scheduled the face-2-face with the team a week later. The face-2-face interview went well and received a call a week later saying I will be extended an offer in a couple of days and asked me some basic questions about my current and expected salary and stuff like that. After that, I did not receive a call from them and when I called them back, I was told that most of the people are out of office and so is the delay. It took about 1 month for them to actually place an offer for me after saying that I will be placed an offer. Not just that, once they placed an offer, they asked me what I had in my mind about the offer and when I asked them a few questions about the visa processing and stuff, the HR said they will have to get back to me in a couple days with the answers. Unfortunately, when they called back after a couple of days, I was told that based on what we spoke on the day of offer, the company will no longer be considering you for this position. The answers to my questions were not provided. I was told that they would sponsor the visa, but since I asked them if they can sponsor me in a particular category, they took the offer back, instead of providing me the answer to my questions. This lengthy process took around one-and-half month, and ended up with an unprofessional way of dealing with the job offers. It clearly says that Reliant is unable to sponsor the visa in a category that I requested for, and instead of saying that they took back the offer. This is very unprofessional way of dealing with candidates.

Got a call from the company and they asked about my college credentials (i/e - courses, etc.) Then they called for a in-person interview. It was with three people (individually) and then after a week, got a call with offer in mail.