Videocon D 20 1 Tt — Auto defrost system not functioning

Hello !
I am from Patna having my address undernoted. Let me inform I have purchased above make of refrigerator in the year 1998. Since last 1 yr or so auto defrost function of my fridge is nonoperational causing frozen ice in deep chamber and low cooling in the lower chamber.
Should i expect your nearby sevice personel to look into the problem-
Address- A.N.JHA
401A, JAMUNA NIWAS,
SARDAR PATEL PATH,
NORTH S.K.PURI, PATNA-13
mOB. [protected]
[protected]
wIth thnks
Y.F.
a.n.jha