I have been called a few times by this number in the past. Very rarely do I ever answer the phone when I don't know who is calling, I have been called 3 times by this number today, all within 15 minutes. I answered the second time, I heard some people talking and when I said "Hello?" They went silent and hung up on me, calling me again a minute or two after they hung up. It says from Michigan but I have no idea who thy are.
I received a call from this number and did a reverse Google look-up, as well as, other searches I'v used in the past as an Internal Investigator. (810)620-7518 is associated with Shila Allcock, and the number goes specifically to Ross Education Center in Flint, Michigan. I would guess this woman is a tele-marketer recruiter for Ross, and is located on the Ross EC property. Here is the service provider associated with the number: BANDWIDTH.COM CLEC, LLC - MI IN FLINT, MICHIGAN. Call back and leave a 'DO NOT CALL" message. Also, go to this US Government link to block calls from this number, or any other number you don't want calling you. It's free and all information is confidential.