Charged double for bank charges

Please may you kindly help me. I'm being charged immediately for transaction fees and have called in previously and spoken to Lehlohonolo from your business call center division. He told me as of July 2019 fnb changed banking systems and we are charged immediately. To my surprise I was billed last night for charges that have been going off my account after every transaction. That means I'm being charged twice. That is not fair at all, worse of all, the statement doesn't show all of this, it shows that charges were being accrued. I then decided while I was on a call with him to make a transaction and I was immediately charged. He is refusing to accept even after he saw that I was being charged. I want my money back and I will not rest until I get my money that was deducted last night