Big help needed~

mannu (1/2 CA) (589 Points)

17 July 2012  
Hi friends,i m in a big trouble......yesterday i have deposited income tax of my client for a/y12-13.. I have done a big mistake....while making online payment..i have entered a/y 11-12.(income tax of 11/12 has already been paid&return is alredy filed last year) instead of 12-13.....tax amt is rs 12437 ....now help me out guy...what i need to do next....is anybody hav face this Situation Earlier? Reply must-