Unauthorised debit from my account to Investment intermedi

Kindly help me to my  recover money back from Investment Intermedi. Because many times Rs.295/-has been debited from my account saying that transferred to Investment Intermedi and it is really not the permission from me. How can a bank transfer money to an another account with out the permission of an account holder. It is really fraud. I am an EPF pensioner earning pension below Rs.2500/ per month. Debiting such an amount I cannot afford to the day today life. So kindly look in to this matter and you may kindly directed to repay the amount taken from my account.
CHANDRAMOHAN UPENDRANATH
CHIRAYINKEEZH, Trivandrum 695304, Kerala
Email: cxxxxxxxxxxxxu@gmail.com