The worst service from a business manager

On the 20th of June Electro Infinite the company which I am the Finance Manager at asked Meshack Mahlangu(Middelburg Business Manager) to check how much credit we qualify, he then advised that there was a block on our director and a letter confirming our director had been cleared was required we found out was that a block was not in place we still proceeded to give him that letter and he said it should take 5 working days, 5 working days have come and gone we are still frustrated and I was then instructed to call him directly under the instruction of my frustrated CEO before I could say much he said I had an attitude problem and proceeded to hang up my call, I then called him back and he told me where to get off and that he would only speak to the CEO of my company,It is shocking that FNB has staff who treat their clients in this manner we really will take our business away if this is not sorted asap we cannot be subjected to this kind of disrespect and service worse over us wanting to give FNB business, I want to know what action will be taken against him and I still need the help on what we had initially requested from him if it is not possible can it be made clear to us so we can weigh our options.