Axis Bank — Limit of axis bank card has been merged without prior info

I have two credit cards from axis bank and had a separate credit limit. but for October month, my credit card transaction is getting declined continuously and I noticed that the limits on the cards reflect a negative balance. I contacted customer support and the executive informed me that the limits were merged on both my cards" This was done without giving any prior intimation at all. While I ask for the prior intimation they informed me the bank has full discretion to make any changes without informing the customer" I ask the executive to register a complaint regarding the same and they keep refusing to register a complaint. Merging of the credit limit without any prior notice leaving me completely stuck with how to make the payment!