HDFC Bank — Credit card - insurance with out permissions

I am Krishnan 59 years old having credit card with Hdfc from last one year . In that they are deducting money approximately 2900 without my knowledge but I was not aware that initially .Now I stopped to purchase from this card even though they are deducting 2900 approx from this I got to know that. so I did contact Hdfc customer care they are telling insurance activated 33000 per year. I didn’t give any form or agreements.so I stopped to pay the bills. Now bank peoples are chasing me and making depression. Please do needful help for closing insurance and that credit card . Also need refund of 5 months paid insurance money

My card number: [protected]