Capitec, worst bank ever

Got a big issue with Capitec Bank. Been with them since 2012 or so. Never had any account in the rears or late payments. Today I went to the store and tried to buy something with my credit card that I just had renewed. Supersized that it declined the transaction, but there are funds available. I thought, maybe its just the vendors card machine. Paid with my other card. Went to a other shop and the same happened. Tap declined, Inserting the card declined. Paid with the other card and it went trough. I phoned customer service and the lady tells me that she can see that there are funds available for the transaction and that there are nothing wrong with my account. While I'm on the line with her I try to transfer money from my credit card to my savings account on my Capitec app and it declines. Her answer to me is that I must be in arrears with an account, not Capitec account, but something ells, because she can see that all my accounts with them are up to date, so she cant help me. Never ever in my life was I in arrears with any of my accounts and for the first time in my life my bank accuses me of being a bad creditor. Now I'm sitting with a good and high credit record and Capitec decided that I'm a bad creditor with no grounds. These days they look like amateurs with there app crashing every now and then and when I went to the bank last week they could not help, because there UPS does not work, and it was not even in load shedding. I had to use money in my savings account, that was for one of my debit orders, because my Credit card with that money in declined for no reason at all. Tanks Capitec for giving me my first ever red flag on a debit order that are going to bounce. I will never ever again tell anyone to move to Capitec. Capitec, you just f'ed up my lifelong perfect credit record with your incompetency.