Rediff.com India — my father's account has been hacked and i need control of it back.

Address:

Mumbai City, Maharashtra

How to retrive my account if all the details of logging into my account have been changed by the hacker? This is terrible! Please contact my back and help resolve things!
How can you let accounts get hacked?
They contain important information and the hackers are changing all passwords and forget password security information!
I am surprised rediffmail has become so terrible.

Account name - [protected]@rediffmail.com
Please prove that youre still worthy of even having customers.

Please contact me at [protected]@gmail.com if you give a # about your customers