Bad Service

I have planned to visit Namibia . I wanted to use my Standard Bank Savings Card to pay for goods I have purchased in Namibiai. At the main branch at Lady Gray Street in Paarl I had my card cleared to be used in a foreign Country. Later I used the Standard Bank APP to extend the time I can use the card in Namibia till 15th March without any problems. To my disappointment ,every time I tried to purchase goods or pay for a service in Namibia, it was declined. When I launched a complaint about this matter it was attended to immediately and I was informed that the problem was solved. but the card was still declined. Only after I have sent a "Declined" slip I was informed that with this card I can only draw funds at an ATM limit Nam$ 3000.- at a time. Now my question is: why could nobody tell me, after they have read the account number for which the card was issued, that I have to open a different account from which I can make purchases in a foreign country with a card. I got an apology but that does not help. Now, when I have to pay for a service for an amount of Nam$3000.-I have to draw it first and pray that I won't get ****** before I am able to make the payment