DGN Technologies interview questions

Multiple DGN recruiters reached out under different companies. One from DGN, one from Collar Recruiting (with a dgntechnologies.com email address), and one from Apple Pie??? The strange part is that when you look up these recruiters' names on the DGN technologies linkedin page; they do not exist. And when you call their corporate office number, no one answers. This is very suspicious. Proceed with caution.