Opening of sip account on my bank account even when not applied for

I have an salary account in kotak bank and account was opened in my company through RM of kotak bank. I completed all the required documents for opening bank a/c and as far as i remember i didnt filled any form for sip but few months later i received message about deduction of charges against non payment of sip and when i asked for reversal of charges they said, they were against the sip, so i told them that i never opened that and its some error from bank side. But they denied and when asked them to show copy of my forms they stopped answering me on mails and hang up my phone. what to do