Pathetic service - Premium client

I started my first account with United Building Society. Along with many other institutions this was taken over by ABSA. Effectively I have been with ABSA for 0ver 40 years. I am a Premium client and have various accounts with ABSA. Since Friday March 12 I have been requesting a R10 k increase on my overdraft that will only be valid until March 25. I have submitted all documented proof of incoming payments on that date. Unfortunately some clown in ABSA has declined this. After all my years with them and a guarantee that payment is in place this is the service I get. You cannot get hold of anybody from management at ABSA - only the call center. I also called various branches that are not able to even advise me. I also called the phone number printed on the back of my debit card - the response that I got? Why are you calling this number it is not correct???? ABSA themselves printed the card with this contact number on. Over the last few years millions of Rand have gone through this account. The R10 k is actually a no brainer to be approved. The call center at ABSA have been helpful and tried everything they can, including justifications. I also have received automated responses from the ABSA premium email address that due to Covid they will only be at full strength on April 17 2020 - that is almost a year ago?? Main issue is you cannot contact anybody who is a decision maker with ABSA you only can deal with the call center. If I had to treat my customers like this I would be out of business. Pathetic service and no accountability or responsibility at all. I am in the process of closing all ABSA accounts and moving on - very sad as I have banked with them my whole life