Nationstar Mortgage Java Web Developer interview questions

I was contacted through an HR recruiter like most others on here through LinkedIn. The first phone call he said he would send me some "useful info" to prep me for an online interview using bluejeans. Right before he hung up the phone he rattled off a high salary amount and asked if I was ok with that. Immediately thought, SCAM, or just unprofessional. Same thing really. Scheduled the online meet for the next afternoon and received 3 different rescheduling emails that night and never received this "prep info"(not that I think it would be useful). Day of the wet finally, got a call at 9am to verify I was going to attend which I noticed on caller id so I ignored to see how this would turn out. 10 mins before the meet I get another call making sure I was attending. I was prepped and ready (for the gym) and was asked if I reviewed the info he had sent me. I said I had never got any info, he verified "he forgot" and he suggested we not go through with the meeting and he would make sure to send the email and reschedule AGAIN. Never received an email or rescheduling notice through Google so 2 days later I sent them an email and thanked them for their interest but I would be withdrawing. Not that this would make a difference for anyone, but I felt someone should project some professionalism. I'm assuming this is a poorly practiced prescreening technique but I will not work for a company that acts like a couple of prank callers when I have serious goals with my career. Spent about a week doing this total but it was fun to speculate what they would say.