FED UP WITH FNB- SH*T SERVICE

I have not received a salary since the lock down was implemented and have been trying to make a payment plan for policies and my personal loan. I have tried to do it through the app and still have had no response. FNB is continuously debiting my account leaving me with a negative balance and when I try to call through I get put on hold and then eventually the call just cuts off. FNB is the only bank that I am experiencing an issue with during this pandemic and am disappointed in the service I am receiving. On the 17/04/2020 my wife sent through my paperwork and received an automated response informing us the matter will be attended too soonest. It is now the 06/05/2020 and I have yet to receive any communication with regards to my many emails sent and I am now receiving threatening messages telling me "further action has commenced" What am I meant to do if my emails aren't being seen too, my calls are being cut off and I am getting nothing from the online process on the app.