STANDARD BANK IS ******

Last month on the 12th March i had a balance of about R3600 on my credit card and on the 13th the balance was 0, i was confused with what was going on and transferred about +- R8000 to my credit card and when i call the bank they said that it was a technical glitch and the balances will be restored but that never happened, i have been trying for almost a month to get a balance statement but no one assists.