Who called from 3086326491

The number belongs to a debt collection agency in Scottsbluff Nebraska.  I don't know who all they handle accounts for, but they got my information from an unpaid hospital bill.

got a call from 308-632-6491. no message was left. I tried to call the number back and it rings once and then goes to busy. not sure who this is

Same thing happened here. call no message and busy signal

Same thing happened here called number rang once busy signal

had 3 missed calls from this number in less than 5 minutes..   no messages   because my number is a private cell number I never call back people that don't leave their name and number unless i know them.. so when this number called and didnt leave a message i assumed that its not important. If it was a message would  be left with the callers name number and also a short message about the nature of the call..