I recieved a phone call from this number. Telling me to call back or have my lawyer call them back immediately or else. Is this a prank?

No it is a scam.  I have contacted the BBB, FTC and Attorney General's office.  I would do the same if I were you as this company had alot of my personal info, like SSN, Bank account number, etc.  They tried telling me I was going to be charged with money laundering, becuase they said I took a payday loan from someplace called US Cash....never heard of them.  He said I would have to pay 8484.87 for my "wrong doings" and that he "might" be able to reverse that if I pay his so-called client 923.00 today.  I told him to f-off and that he was a scammer and I was turning him in for fraud.

Its a major scam i reported it to the local news in Phoenix and they did a report on live news about this and over 100 people came forward with same bull

They called me at work to say they are from the Law Group of California and his name was Franklin Gibson. And that this was a very serious matter that will turn into something major.

This same number called me told me that I too owe this US cash, which I believed because they have all my info, but when they told me that I had to go to court in my state in my town. That wasn't making since and they told me that their childcare taker would watch my child I told them that the devil was a "D" liar. The guys name were Brandon Watson and Adam. I'm suppose to come up with the money in the next 3 hours and call back by the end of the day.