Beware of travelling with a Nedbank MasterCard

Beware of travelling with a Nedbank MasterCard. I used my card shortly after arriving at my holiday destination to draw money from an ATM but the ATM didn't return my card and the bank was closed. I called MasterCard immediately to block my card and they repeatedly assured me they were doing so. However, I then saw multiple ********** uses of my card via the bank website that took place after I had called to block the card and that totally depleted my credit. I have subsequently called both MasterCard and Nedbank multiple times, wasting my overseas airtime, and each time, I'm just told it was blocked and they are still investigating. Each MasterCard agent refused to give me a reference number so I changed to calling Nedbank, who gave me one but they promised email confirmations of my call which they never sent. It's now been over a month. I fortunately had other sources of income - I'm scared to think of what would have happened if I hadn't - but the stress has and is still immense. How can this be the response when MasterCard was called to block the card even before the ***** began?! Please can this immediately be resolved.