Innalillahi wa innaliayi he raajioon.....we all pray to Allah to reward you for your loss, to help you and your family out of this situation. have faith and keep trust in Allah. every decision from Allah is wise and logical........yes some seems good for us and some make us sad. Allah has made us all....we all will return back to HIM one day.....some soon some later....
buddy what I believe is cio will cash ur DD for 1400, cos it has reached their pretty earlier. now what u can do is send additional docs, send Death certificates and all other necessary doc about ur Child who went in Jannat. they should in fact they must reimburse your additional fees.
one more thing to bring in to your notice is......as the cause of death you mentioned was cancer....in your medicals they will be going to ask your whole family to go some additional tests. I know its long way down there......at least 3 months to get u MR but during my MR they asked all this that any family member, father mother sibling children faced cancer, tb, diabetes, Hepatits abc, dengue, congo, ebola and some other diseases and they ask to do additional blood tests, urine tests and can ask to go under some scans other than X rays.
my wife is doctor by profession but not primary applicant, she was asked to go under 4 additional blood tests costing 2000 rupees more.
so u have time, do ur some research and get mentally ready for upcoming things, this will make all the processes for u and family easier than surprise or shock. this will also help u a lot in many different things in process.
in the end I again pray for the dear departed.....I believe that the little angle is enjoying in Jannat and I pray for u and ur family, may Allah reward u all and bless you. ameen.