Typically the bank will contract with a local real estate agent to market their properties after foreclosure.
The real estate agent will be the bank's "eyes" in this case, since the agent will be required to verify occupancy (occupied or vacant), send pictures of the home and contents (if any), assist in evicting any occupants, clean up the house if needed, turn on utilities so the landscape doesn't die, and winterize if necessary in the colder months.
The bank will normally do some investigation before the home is put on the market again, and they also have to work to either evict the current occupants or provide them some incentive to leave voluntarily. This coud mean a delay of a month or two before the property can be sold to a new buyer.
The bank's Asset Managers will work with their local Realtor contact rather than taking calls from the general public. They generally don't have the resources in place to take calls from the public.