Reserve Bank Of India [RBI] — ecs mandate charges

Website:

www.canarabank.com/english/quick-access/service-charges

At end of march 2018, canara bank deducts ecs mandate charges from my account. Since, i had invested in mutual funds and bought insurance policies, so ecs was registered, as sip auto debit was in place. Bank charged me ecs mandate charges for every sip and every policy. As a proof, you can find attachments. Even, as per rbi and canara bank website ecs mandate charges are nil till date 27 apr, 2018. When i visit branch they said they don't have any idea. It is working from system itself. When i said i will file a complaint in rbi, they said you can do whatever you want. The crux is how can they deduct from my account without any prior notice, how can they change process in between fy. 354*6=2124 rupees were deducted by 6 transactions when rbi and their own website says that ecs mandate charges are nil.