Bajaj Finance — Refund of Cmp Mandate Bajaj finance

There is a deduction of 500 from my account yesterday there are no pending EMI from my side to be paid but the company has deducted for some CMP Penalty i need my money back are else I have to take legal action for this, in this situation we are unable to run our family and this companies are deducting the amount without any notice of customer, i need my 500 to be refunded to my account