I also experienced a similar string of questions from this number. He had an Indian/Pakistani accent and said he was working for a company called Gross and wanted to send me some research he had done. When I told him I wasn't interested in giving him any details, he quickly hung-up. I would suggest to all not to open any links sent from him.
I got a call from this company wanting to verify my address and when I asked why, they could give me no reason except to say it was for their records. Since they called me on my mobile, I blocked them from calling again.
Man who could barely speak English (had to repeat himself several times) called twice for a high-ranking executive who isn't located here. My irritation level having reached its saturation point, I reminded him that he'd already been advised of this. He apologized and hung up.
He had known my name somehow. He asked some multiple choice questions such as what is you current position etc. He didn't tell the reason clearly. I was really confused.