They are saying that they're debt collectors. Go crazy on these fools.
I got this call from late 2018 and I just remembered having it. The number is from Midvale, Utah but with a simple search of the number you get (https://findwhocallsyou.com/888-221-5155) people saying they're scammers. According to the comment they change every once in a while so be ready for what happens.