called and did not leave a message

called and didn't leave a message at all

Caller left voicemail, said they were ARS National and had a time sensitive matter. Call back number they left was 866-274-3582.

they called and left me a message saying: ARS. sound like IRS, they are pretty smart. so i used their phone number with reverse look.
http://www.arsnational.com/

Collection agency that tries to collect past statute of limitations debts. Paying them will not improve your credit. Your money would be better spent keeping new debt on time/current, or keeping other debts from going into collection status. Lenders are mostly looking at the last 24 months of your credit, and you score can improve from establishing new accounts and keeping them at less than 10% of the credit limit available.