Legally, if the landlord did not use the money for utilities, resulting in you suffering some loss or "damage" or cost--like having the utilities shut off, or having to pay more to keep them on--you can sue him to recover the money. You need to know where he is, however: unless the legal papers (the summons and complaint) can be legally and properly "served" (delivered in the way required by the court rules) on him, the court has no authority over him and cannot take the case.