Canara Bank — withdraw less deduct more

i had withdraw money from canara bank atm on 17 august from Borivali East ATM Near S.T Depot Mumbai.i had withdraw only 600 hundred and again check the balance..i get 600 hundred in first time and second time only i check the balance but they also deduct 600 hundred more from my account..I get only 600 hundred and deducted 1200 from mymaccount I am using SBI ATm..today is 31st august but i didnt get the my money back.Please see to it.My account Number is [protected]..

Thanks
Ashish Chadha