Kotak Mahindra Bank — Getting credit card bill that i am not using

Address:	Mumbai City, Maharashtra, 400076
Website:	www.kotak.com/email-us.html

I used kotak credit card (Last 4 dight is 9330), i always pay dues before due date through my online banking, dec'2016 i paid rs.15256, december onwerds i try to do purchase getting error message i used another card, jan 2017 i got sms for dues i paid rs.320, after two week i got sms again for dues rs.460 that also i paid, february i got bill for more amount i contacted customer i inform them i am not using card how i am getting bills, they told me i didnt paid balance of outstanding balance, then i understand kotak bank is issuing credit card bill in another card number (Last 4 dight is 0868) that card i didn't received, i inform this matter to kotak crdit card through email, and inform to customer care, one person came for collecting the dues, till today nobody taken any action for this matter, now dues is approx 3500/-

They harassing me and my family for payment that iam not used the card, this will affect my credit score also. I hope any kotak crad authorised person will contact me and help to sort out this matter, other wise informme how to sort out this matter and how i will get back the excess money i paid.

Jayan