Wrong amount received from which was withdrawn

I went to capitec SPARK ATM on the 11/10/2022 to withdraw money i requested R300 and i received omly R100 after that the machine went " out of service" but R300 was deducted from my account, i waited and waited thinking that the machine will bring my money out but nothing happened i then decided to call capitec helpline while i was still standing at the ATM i reported the incident and they asked me what happened and i explained everything happened, they told me the investigation team will invetigate they even gave me incident number which i will use if iwant to querry, ever since then they have not gave me a feedback about my case until i call them and they tell me that i will not get refunded because i did receive all my money which is wrong i did not receive all my money its only R100 that i got from the machine, please help me get my money back from Capitec Bank i cannot be ****** by a bank like that.