ABSA ATM payout SHORT

I withdrew R2000 from an ABSA ATM. The machine only gave me R1850. Now I am trying to get the R150 back. No luck. I placed a complaint with all info on the ABSA website and even received an email stating that someone will call me. Crickets... No call. Then I called their ***** line. The operator told me that I must go to my ABSA branch. I told him that i am not an ABSA customer and the card I withdew with, was a Finbond card. He stuck to his script. "You must go to your ABSA branch". No sense it talking to him any longer

ABSA, how do I get my money back? Kindly assist

Terminal: 4539 Auth # ***3 RNN: ***