Worst service ever post ***** been committed

After almost 6 weeks post ***** on my creditcard, they called me today to report my ***** case is decline. I, according to them, dis authorize the transactions with an OTP, which I did not!!!!!!! My limit was R50 000 and the stole an amount of R72 200..... They expect me to pay off something I did not use. I am a client for 30 years and this is the result of ***** reported. I didn't owe a cent on my credit card everything paid of 2 June 2022...... I am a trauma sister that worked 12 hour shifts over that weekend the ***** was committed and still they decline the ***** case. How pathetic and terrible service after been a client for 30 years. Standard bank you gave me the worst service ever. Will not leave this here I will take it further even if we need to go to court!!!!