India Post — Regarding maturity amount of nsc

Address:

700049

Dear sir
I am living gujarat but my nsc issued by nimta post office which comes under belghoria post office. Pin code 700049. I came here means west bengal for 2 weeks but post office employee behaviour is so rude specifically the post master i can't share. Last 5 days i am coming and going back without any positive work. Today the post office official says morning you have to come and don't expect you will get your service. Now my questions are where i have to go? And when my work will be done? I can't stand post office 5 to 6 hours due to my busy schedule. Pl help and do action.