Will police arrest the accused or after investigations they will

What are the facts? What is the issue?

flat owner has taken advance from us done agreement and sold the property to 3rd person with in agreement time and when asked behaved appropriately... so I booked a complaint in the P.S .. but still no action is being taken on them and they r freely moving. I got a message on my phone as ur complaint booked under crime number xxx/2019 u/s 420 406 506 354 IPC .
I am not sure wheather this FIR is registered or not , as the accused are still with no fear.

ok I will go to police Station tomorrow and ask for the copy

Facts posted suggests the matter to be a civil dispute. The Police have no authority to interfere in civil disputes. The right procedure is to initiate civil action.