Disappointed we work hard not to be treated like this

For the past 4 days fnb has been debiting my business account R155 each day I don’t even know for what all of a sudden, my card goes to a negative on transactions made, I don’t even remember applying for overdraft mind you it’s a debit business card but money just goes out. I’ve been banking with them from 2020 and now all this just starts, even considering to open a business account with another bank and close this one coz I can’t just keep loosing money like this it’s affecting my business. This access fee that just started this month and haven’t been there for past 4 years where does it come from 😳