Airtel — suddenly all services stopped at my airtel sim

Address:

Pabal Road, Sainagar (Kharpudi BK//), Ratnagiri, Maharashtra, 410501

Dear sir/mam,

I am a airtel user my number is [protected] my all services were working till 9 pm yesterday night after that i don't know how but its showing emergency calls only all my contacts has been stopped. This has affected on my sim only all other airtel subscribers didn't have such issue & when i called customer care they are saying to buy new sim from airtel store. Why i should buy new one while my older sim was working properly till yesterday..