India Post — money order delivered by unauthorised person

Address:

New Delhi, Delhi, 110085

We have received a money order on 19 july 2018 of rs 150. The money was not given to us by our dhobi (who is not authorised). the money order doesnot contain any information regarding its source or sender's detail. since morning I am trying to reach the postal department but either they are giving me another no to call or they are not picking up the call.