Std Bank Credit Card Service

For the last 2-3 years, every time I make an internet purchase with my credit card, sometimes with existing regular monthly subscriptions but also airlines, AirB&B, train tickets, theater tickets, Takealot, etc. My credit card is blocked and with no notification. I suffer the embarrassment of my card being rejected in front of others and then the ordeal of going through the ***** Dept to unblock my card. 2 mths ago my card was blocked on the last day of the month so all my credit card payments for the next day, 1st of the mth failed. It took 3 separate calls and a half a day on the phone to finally get my card unblocked snd payments reinstated. The ***** Dept is never able or authorized to give a reason. Std answer.... system blocked my card. Monday I asked how to get a reason and was told I had to lig a case and wait. Two days on I called back to be told there was a separate number to query cases, which I had not been given and anyway, not to expect an answer in less than 7 days. Std Bank has no timely way to log and proceed complaints and after more than 2 yrs of unexplained blocks, have app**** for an FNB credit card. If all goes well will change banks. Ss a high net worth individual, pathetic service.