Death claims

My father passed away couple of years ago and these people decided to sen me a email a year after hes passing.. Stateing that he has unclaimed property and i need to fill in some documentation witch i did and forwarded it with all the necessary information and death information about my father.. And then they never got back to me wich they must do informimg you they recieved all the correct documentation and that the sent it to an estate claims agency the NBCRFI.. AND everytime i send them a whatsapp saying that i cant get hold of that NBCRFI PLACE and the numbers they send me does not excist and they do not reply on my emails the get an attetude and when i phone them they put the phone down in my ear! So it makes me think and wonder if they are involved with fraud or what???!!