HDFC Bank Securities — derivatives trade activation

Address: Mumbai City, Maharashtra, 401202

Hi
Earlier i didn't had access to derivatives trading. I went to hdfc bank branch near lower parel. I submitted all the documents which i had asked.
Now when i went to trade on derivatives i didn't had access. Customer executives said my form is rejected because i had submitted only 3 months bank statement and they want 6 months statement.
This is unfair. I had submitted all the documents which they had asked. Is the kind of service provided by them??
I want to start my derivatives trade and no one is ready to help.