Lost all in to my account on the hands of the Standard Bank

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. they make f$k sick as I have lost and verbal, mentally and financial abuse by those bank and they employees. how should a lost my *** money like this in the bank. second what they are investigating as they see the transaction is running because around R6000 was with draw where's I was in Brooklyn Branch and show the consultant on my phone. what proof they are looking from me? this is a bull sht actually. and incompetence bank and their investigator. I'm currently willing to move from this nightmare bank to another one because since bank use it I have go through this way their handling my case. and some of my friend and those i working with them we are very concern to move to other bank because a *******ion activities in this bank an poor monitoring our money more special during December as ******** are busy with their mention through to our account. How should they help me in this matter because