Universal Sompo — reject my claim without any valid reason

Address:

2,MOTIJAL BASAK LANE,C M C,PHOOLBAGAN NR-CHARING CROSS NURSHING HOME, 700054

Dear sir,
I have sent a mail regarding my claim on 25 march 2019, but still not getting any proper response from your end and also not picking phone from claim department.
They have reject my reimbursement claim without any proper reason. They are not response either in mail or by phone.
Previously i have talked to them after that they are giving any response after decline my claim without valid reason.