Call Centre not available

I was at the airport , flying to Europe on Sep 2. I called the call centre for more than an hour, trying to inform them that I will be out of the country. One of the currency exchange agents also tried to contact them when I had no funds left on my phone to make a call, but to no avail. I am really disappointed in the nature of the service from FNB- not knowing if I wll be able to use my cards when in Europe, was an unnerving feeling. I am , to say the least, greatly disappointed and has lost confidence in this establishment.