11 June 2015
No need to surrender both the PAN cards. you should surrender your old Pan card & make a rectification for the 2nd(new) PAN card. this is the correct & easy way to solve your problem.
11 June 2015
you can rectify any one of them and surrender the remaining one....(Unless of course you are not comfortable with the PAN allotted to you, either as alphabets or numbers...)