SSC — silly error has been made

Dear Sir/Madam,
Paper code-468NM9 (SSC 10+2 held on 20/10/2013) answer keys provided by you are wrong. you have provided the same keys for general and V.H students. Therefore, around 15-20 keys are wrong in the set. Please correct them as soon as possible..
How such a silly error can be made.. You just pick up the paper-468NM9 and find out what should be the answer of questions 43-50, 147-150 and even in english section few answers are wrong..
I have worked very hard for the exam. Please make corrections.