Kotak Mahindra Bank — False charging of bills and no response to complaints

They have falsely handed over a credit card to me which i have not even recieved and they are sending regular bill messages to me to pay it without even using it. I tried to contact and complained on mail, centre and on KEYA and calls but they ignored my concern totally.
They are not providing any service regarding this and i am not able to operate anything because even my debit card pin has some problem which are not being solved.
They also never call back or revert anywhere.i have been trying to reach them since 5 months now.