Nedfleet cards - Worst experience ever

Our business has been banking with Nedbank for the last 13 years. The Nedfleet cards for our business always worked fine but they failed to inform us that they've got an alliance with Caltex and if we use certain Caltex garages that we will receive a discount. We eventually found out about the alliance and app**** for the cards. What a disaster. I had to complete the application etc and send it through. I've received new Nedfleet cards but not the correct Nedlfeet Caltex cards. I kept on asking our Nedfleet representative Nic van der Merwe when the cards will be active because my trucks started to fill up at the Caltex garages, he rep**** that it was their fault, I never should have received the Nedfleet cards and they are busy with it to register our Caltex account. In the meantime I lost a lot of money by putting in diesel at the Caltex Garages. Then I eventually received the Caltex cards but the problem was that I received it at 10h30 in the morning and I've got 27 vehicles all over the country. The Caltex cards were active but they cancelled the normal cards with immediate effect. Although Nic told me that the old cards were still active for 10 days in order for me to get my cards to all my vehicles that was not the case. They cancelled the normal cards with immediate effect and I had about 7 trucks stuck without diesel and they couldn't pay tollgates. Just before we recieved the Caltex cards I told Nic I don't want that option anymore because I found another solution which saved us even more money but that was not done. So I've received my 3rd set of cards (normal Nedfleet cards) last Thursday, I've couriered the cards to my JHB branch. Problem again, the Caltex cards which was also promised to be active for 10 days also didn't work, same issue as before. Now some of the the Nedlfeet cards are working and others not, my guys need to phone for authorization the whole time. This was the worst experience ever with Nedfleet. We've got a business to run and to just pull up your shoulders and apologize is definitely not solving my problems with trucks standing due to incompetence.