bank fruad

I had a credit card with african bank and on the 20th of march I went to withdraw an amount R2000 from their ATM but only got R1000 in R50 notes however the slip shows that I took out R2000,I i went inside the bank to get some help,the consultant came out with me, then again I withdrew R1000 but still got a lesser amount which was R500.we called the call centre and I was advised to fax through an affidavit,copy of I.d and 6 signatures and was told I'll be charged for these investigations an mount of R45...its the 6th of April I still have not received any help they keep making empty promises I am being sent from piller to post but still my matter has not been resolved.I am really disappointed at the kind of service I got from this bank.I was left broke and had to borrow money from people to meet my day to day needs.please help.