lost Call list and contact list(approx 450-470 contacts)

Hi,

i have lost my call list details and all the contact list.....

i realised that today morning when i checked my mob and none of contacts were showing up.....

and then i checked my call list it was showing empty....

and when i tried accessing whatsapp, it said memory has corrupted,...

lost Call list and contact list(approx 450-470 contacts)