I have been scammed

[Muhammad Ahmad]

Hi,
I’m coming to SLU this fall for my master's and am landing on the 20th of July. I wanted to secure a place beforehand and I found a place on Facebook Marketplace. I signed the lease and paid 3 months' advance rent and now the landlord is asking me to send 2 more month’s advance.

I have a feeling that I have been scammed because the owner made an excuse to not meet me when I land and is hellbent on the advance payment. I contacted a realtor and he said I have been scammed.

I just called the landlord and he hung up and blocked me when I asked for a refund. 
Now what should I do? Should I report to the police or what?

TIA