BMO Harris Bank Account Or Service Complaint

BMO Harris Bank account or service department,

Checking account Problems caused by my funds being low Illinois

BMO Harris has charged my checking account an overdraft fee after the account was in the positive status. BMO does not have an alert system when accounts are overdrawn and I have overdraft protection. When the account is not funded transaction are not suppose to go through, they allowed the transaction to post to my account. Once I became aware of the negative account status I transferred funds into the account. BMO Harris sent me an email today stating I have an overdraft fee after I already brought the account back to a positive status.