Canara Bank — NMMB charges

Address:

Aadarsh nagar bus stand ramgarh Jharkhand

Sir,
My saving bank account in Canara bank ponneri. My account no. is[protected]. Name - Sandeep kumar mahto in my saving bank account balance deduct incessantly from 02/07/2021 due to slab wise nmmb charges. But this charge applies when my balance less than rs.500 as say in Canara branch staffs.
So pls if wrong charges deducted by system, pls refund my balance in my account as earliest.