Discovery Bank Protecting Themselves at our Inconvenience

So, I have a full suite of services with Discovery, including life policies, car insurance, medical aid and I bank with them. I have a positive balance in my credit card ie I'm not borrowing money and from time to time make online payments for accommodation, flights and retail goods. Everytime I need to use my 'positive balance' credit card to make a purchase above some amount (only Discovery knows) they block the payment and have to review it - not to protect me, but them - which is fine. However, the first time this happended after 2 hours and 10 minutes I had to phone them because no one had called me to approve the payment. They were terribly apologietic - which they seem to hide behind. Even a manager called and apologised as well, during which I advised he'r I will be using my 'positive balance' credit card to make an online payment (and gave her the vendor and amount). a couple days later I made the payment and once again the payment was stopped for review. This time I didn't call them, but rather waited to see what happened. After 4 hours someone from Discovery called me to go through the approval process!!! Surely if they need to review and approve a payment to protect themselves - and inconvenience us - they should have sufficient staff to call within an acceptable time after the payment is stopped, maybe 5-10 minutes? Not sure if it's only me but I've never known Discovery Bank to be like this!