RBL Bank — Credit card Privacy data misuse

I am usid RBL bank credit card from last 4years. Last month I didn't pay bill and collection agent contacted me and I said I will pay before the next bill generation date and I am contact with him mean time. But without knowing me he is contact with me and he is also contacting my phone contact list with out knowing me and saying that I am not paying the bill. He is cotacting continuously for 3days before knowing to me. One of my friend who contacted by the collection agent contacted me and said they are continuously call me and disturbing and saying that he is not paying bill. My friend asking me why you gave my number to them. I said I didn't not gave any number and I already contact with him but without knowing me he contacted you and I don't know how they people got my phone contact list. Immediately I contacted the collection agent he lift my call and talking nicely tell me sir and I said I am in contact with you but you didn't said anything that you are calling my contact list and how you got my contact list phone numbers. He didn't say how he got numbers but he is saying that until you pay bill we will call you contact list phone numbers like this. With out asking me how you will contact them and how you can hack my phone. He is not saying anything about that and saying that we can do anything what ever you want your can do but we will do like this only he said.

RBL bank is resulted by RBI and every bank should follow RBI guidelines. How openly they are talking like that and illegal hacking phones numbers from phone.

I and my friends, family members got call from below two numbers
[protected] & [protected]