***** on my account

standardbank.co.za

I'm using standard bank for a long time but fewer weeks ago, my bank card missing and no one know my pin, but to my surprise of my money with draw more several times until I go to the bank to lodge a complain about this matter. and they promise to do an investigation as plus minus R15000 have been with draw with 24 hours. after they call me and say they will never help me with anything which means in other I have loss all my money and those people were very rude to me when they call me. Tell what should I do and they say they need a proof what kind of proof when I have lost a lot of money from their bank.