Nedbank is a massive security risk

It's now 3 working days since I logged a dispute after a third-party made 4 unauthorized purchases from my account. I have not received any feedback from Nedbank. When I spoke to one of your consultants they told me to call the third-party and ask them why they took my money! What kind of lazy banking institution is this? I myself cannot make online purchases without verification yet somebody else made four within twenty four hours and Nedbank did not even flag it! If I need to verify myself for online card purchases why shouldn't someone else verify themselves and get my permission first to take my money?