I want some answers

So ive been with Standard bank for 3months now and already its showing me flames... Lost my gold cheque card a month back, i called in and reported the card, got a replacement, the same month on a certain day i decided to download the app, went to my statements and i came to realise that there are unauthorised transactions, somebody was busy swiping my card at the toll gates outside jhb.. the time i realised that there was already 9 transactions that had went off frm my account between the 18th and the 20th May but the ***** dept never even called me to notify me.. Went to the bank to open a case, i was told that theyll stop the card and i must pay those amounts of a total of about R1700.. 21st May there were about 2 same unauthorised transactions again, when my salary got in on the 24th then R1700 was deducted as those transactions had now put my account on a minus, went to the bank again, then the consultant told me the same story, third strike on the 25th May has hit again 4 toll gates unauthorised transactions went off from my account again.. Called in today and the consultant by the name of Calvin had no answers for me kept on making me hold on for a long time and at some stage he had muted the call as i was talking...

I need some answers....