FNB not interest in customer complaint

All systems failed. After not getting help on secure chat or customer service or internet banking i had to drive to the bank. In the bank i tried to log a complaint on the FNB app. As soon as you have entered your complaint the "submit" button disappeares. When the form is blank the submit button is there. Then finally secure chat came back to me with no help whatsoever. I asked for a call and i was promised a call in 15-30min. After 2 hours i asked for a phone call again. I was told to use the app whih is not working. I tried another route on the app and got an error message. On secure chat i was ignored when i asked for a call as promised and was again told to use the app. I have tried all avenues to get help and to log a complaint and NOT use social media. FNB is not interested in hearing me, helping me or calling me.