They continued to call my google voice number for about 3 weeks, finally I got some free time and gave them a call back. Asked why they were calling, they asked for the number, said they were looking for a "Ho Mann" to which I responded that no person has ever been attached to that number in the 3 years I've had it and they removed me from the list, no issues since.
get several calls from this number everyday, but they don't leave any sort of message. If they really are a debt collection agency, like many have suggested, then they must really not have any legitimate business with me.