Question about overdraft fee reversal?

We had 5 overdrafts occur on our business account because the bank was "offline" when we made our deposit. When we brought it to the attention of the bank - they said they would refund half of the fees. We were NOT happy but figured that was the price of doing business with this bank.When they hadn't done the refund after 4 days, we deposited a cashiers check (which they said would go in same as cash) long story short....they deposited it as a check and wham 4 more overdrafts came in. ( fees would NOT have come in had they done what they said with the refund OR the "same as cash" cashiers check) Now they're just giving us a huge run-around saying it's out of their hands and they don't have the authority to do refunds. PLEASE ADVISE.