Indusind Bank — Credit card torture

I am getting continuous calls for every 15 mins about credit card offer. I rejected it so many times. But they are calling daily, how many times i need to tell them. Even I can't sleep happily, i am putting my mobile on silent mode while i am sleeping bcoz of their torture. If I get any emergency calls who will be responsible for it. Please stop this harrasment. Many banks are there but this type of torturing bank i have never seen.