Salary return ay14-15

while filing return(refund of excess TDS) of assessee by mistaken surname of assessee's father wrongly entered as garg instead of Jain. all other details are correct. the return was filed through excel utility of department & the X M L file also deleted. should the revised return b filed for d error if yes is any option to get back d file from department so dat only suitable modification can b done or have to fill again full details.