ACS rude, threatening to have me arrested, Internet

Today I received a phone call from a weird # 000-000-0000.  Did not answer the phone. They left a message which I did retrieve and was told that I had an outstanding loan for $640 for Advanced Cash.  Told me that if it was not paid that I was going to be arrested.  I spoke to this Mike and he had a very deep accent and then spoke to a Dan, who had a very deep accent.  I told him that I had paid this in February told me I was lying and he read o0ff all my information to me.  Told me that I had up to Friday to pay this.  First and foremost me like a fool not looking into this I have paid almost up to $5,000 for a $300 loan.  Which is crazy.  I also called back to get information and they told me that they could not give it to me, so I told them if you can not give me the info, I am going to the attorney general and they told me to stop threatening them.  I9 have been reading that I am not the only one that has been scammed on this.