united cash advance threatend to debit my bank account and call my employer Internet

i received an e-mail saying they were going to debit my account on 5/18/2013
i dont normaly open e-mails i dont know but this one caught my eye
they had my address, social security number and my bank name and account number
they said i was in default on a loan with them and they were going to debit my account in the sum
of $535 on 5/18/2013 unless i contact them by phone or e-mail to make payment arrangements
the charge off date was back in december of 2010 it also said the orginal loan deposit was to the bank i have now and the e-mail was dated for 5/19/2013
the account number i have never existed in 2010 i have changed banks in aug of 2011
the e-mail was sent to me the day after they were suppose to debit my account
so i called them and left them a message explaining that this is fraud and idenity theft and i wanted to know how they got my info,left them my number and no call back
so i e-mailed them and still no response, called my bank and told them what was going on just so they know whats going on, then called the police and made a report
i will never put any personal information on the internet again i feel no site is now
and my advice never do a payday loan from any company