Definitely a Robocaller trying to verify that your number works.
If you call it back, you get a recorded voice asking if you want to be placed on their Do Not Call List but no other Identifying information.

Left a message stating that if I want to boost followers on instagram then go to a .net web site. I'm not putting the site out there to leave a trail to. I don't even have an instagram account. BLOCKED!

Called me, I did not pickup and no message left.

Called me also no message left.

Called my cell, but only rang twice.