Lux Solutions interview questions

It's a scam! I had an interview yesterday with fast trak (45 min drive from my house) just to get there for a 5 min interview so they could put a "face to the application".. complete waste of time. That could've easily been done over skype or something. Next day (today) I had 2 separate interviews from 2 separate companies that called me. 1 at 1:30 & 2 at 2:30.. i get to interview one and notice both companies from interview 1 & 2 are literally in the same building in the same exact room! Super sketch. One company called one solution management and the other nation united inc. The guy interviewing me asked if i could come in on monday at 10 for next interview I told him I already had another interview he asked with who I told him fast trak and he told me to cancel with them (very unprofessional) i also stated i had another interview right after with the company who shares the same officer with them and he told me to tell the lady to cancel that as well..ok no problem. at this point im not going back to any of these places because I they all waste my time, look the same (run down), say the same things, and are all super sketch! As im leaving i tell the lady to cancel my 2nd interview and she tells me oh I already did! ummmm... what?!! how can she cancel my interview without me telling her... yeah pretty sure all of these companies are the same company.. not sure what they do.. if they even make money or what.. but im almost 100% sure these are scam companies..