Hello Aspirant,

See the mistake that you have done is little bit big and it can cause you some trouble because incorrect roll number might misplace your copy and due to which your result might get affected.

So I would recommend you to contact the examination center which has been allotted to you, because they can help you with this issue to some extent and from next time be more careful.

I hope this information can help you upto some extent.

Good Luck!!!