Card snatched at ATM and Discovery Bank not willing to assist me

I used a Capitec ATM as Discovery does not have ATM's. My card got stuck in the ATM. I assumed that the ATM had my card, I went to my car to get my phone when I saw that all of my money was out of my account at 'n different bank at a mall nearby. Which means that my card was snatched at the ATM. Discovery Bank says they can do nothing about it because my pin was utilized. And Capitec says there is nothing they can do for me because I am not a client of theirs. I did not know there was a device in the ATM that kept my card. I am a loyal customer of Discovery. I have Vitality, Medical Aid and policies with them. I am so upset that no one is willing to help me get my funds back. I am a loyal customer of theirs. I will be changing my stuff because they have not been loyal to me. I was forced to use a different ATM because they don't have ATM's. Surely if they looked at the footage they can see it was not me that withdrew the money out of my account. The investigator said they did not need to look at the footage because they cannot do anything about it. I contacted Capitec to tell them that ATM is unsafe and they also said they will give them the message. And the worst thing is it did bonot only happen to me that day. When I went to the police station there was another lady which it happened to at the same ATM. How could I have known they tampered with the machines. I have a family to feed. And they are not willing to assist me. It makes me upset and angry.