Worst Service ever from FNB

I have a query on my credit card statement for FNB Bossiness. I received the contact number for FNB credit card banking today from my account manager : *** I proceeded to phone the number and spoke to a lady, 2020-10-13 @ 11:20 (approx) After talking a few minutes, she refused to assist and do the calculations as I requested, to explain to me what is going on. She insisted I send an email to a help line. I have been waiting for months on an answer for this, and then requested to speak to her manager. She refused, stating that she is working remotely. I then asked her to give me her managers email, which she refused. I insisted on this, and then she proceeded to disconnect the call. She refused to assist me in any manner possible

This is not the level of service I expect from FNB and I am extremely upset about being handled like this I feel that this employee should be taken to task in the most severe manner possible