Nedbank allowing ********** transactions to go through a blocked card

My card got lost last week Saturday at Forest Hill mall,I used the moneyApp to freeze the card so transactions would not go off. To my surprise when I checked my balance a few days after I was in the minus due to unauthorised toll gate transactions. I was shocked because 1 I I was under the impression that the card is frozen and cannot be used and 2 I had not received a single notify sms. I called the call centre and was sent some dispute form,the form has different reasons for the dispute but mine was not there. The lady confirmed that the card was blocked but to my surprise I see now that the ********** again went on a trip at my expensive. My account is now over by R280. I would like to know why is Nedbank not protecting me as their client,how are they allowing transactions to go off a blocked card and not getting notify smses?as my bank I would expect some security like how other banks protect their clients from such mediocre. Please reverse all those charges and transcations as I will not be liable for them and ensure that no other transactions go though. I will not be filling in that dispute form and i urge you to investigate this matter,I am stressed as it is and I would not like more unnecessary stress from a bank that can't protect its clients.