Hey there @trilok31bhuraita, thanks for using Dropbox and welcome to our Community!
Are you 100% sure that you logged into the correct account?
May I ask how long has it been since you last accessed the account? Do you see any signs of your missing files in the events page?
When it comes your account's quota and the space you had earned through referrals, do you see any signs of them in your plan tab?
Keep us posted!