Apple India — IPhone 5S Auto Contact detection

Address: Jind, Haryana, 126102

Website: www.apple.com/in

My mobile contacts are auto deleted from iphone 5s many times.
It is causing inconvenience. Last year this type of incident happen and it took me 6 months to rearrange all contacts. Now again most of my contacts got removed. It is very painful to loss contacts. Apple support should resolve this issue as soon as possible or tell me how I can get all my contacts back.