Seller did not turn over last month's rent at closing

[Darren S.]

Hi

I just closed on my first property, a duplex that I intend to move into, and it seems the sellers did not turn over all monies at closing. After closing I went to go speak with my new tenants to introduce myself, I also gave the first floor tenant a notice of non-lease renewal and several days later the 1st floor tenant asked if she would get her last month's rent back. Her lease didn't say anything about a last month's rent and the sellers didn't turn over a last month's rent, only security deposits for both units; I told her that and asked if she had a receipt or some paper trail but she didn't. At this point I thought she was trying to get over on me cause she was upset after I explained to her why I would not renew her lease. The 2nd floor tenant said she also paid first,last and security when she moved in and she has proof, she provided a bank statement with the scanned checks showing the total amount she paid when she moved in, 

I went back to my agent and ask him to speak to the sellers about this, the response I got back from the sellers says that they don't have the money after covering closing costs and repairs. The total amount in question is $1740.00. The sales agreement did say the sellers must turn over the security deposits. I plan on writing a letter to the sellers explaining the situation and to turn over all monies before seeking some legal advice. So what are some other recommended courses of action?