My account has been debited with Rs 2600 + 10.8 % service tax as consolidated charges . I checked with bank. they told this is charge for not maintaining Quartelry Average balance

charge for Not maintaing quarterly balance - 500
Charge per transaction with out maintaining balance - Rs. 100 ( Per transaction ) ( 22 * 100 = Rs 2200 )
for Transactions Rs 80 or 100 or 200 they deducted charge of Rs 100 . how it can be possible ?

charge for not maintaining quarterly balance - 500 is fine . But how they can charge for transactions . i am not using banks money . i am using my money. Account minimum balance is Rs.2500 . and the transactons charge they should charge immediately after the transactions not at the year.