customer service deteriorating

FNB deducts small charges R6 each time for 'no funds' whilst there was enough money in my bank accounbt. I've been looking everywhere on the website and the banking app to lodge a complaint. FNB has made it intentionally VERY, VERY difficult to lodge a complaint or query something. Disgusting FNB, your customer service is deteriorating. You have closed branches, reduced branche sizes, reduced staff obviously with the intention to maximise profits. Customers are bearing the consequences. Why is there not a simple email address to lodge a complaint, like you used to have years back. No need to answer that!