Bad customer services

What a bad services I received from Nedbank dosbonville branch from customer agent Sonia .It was on the 30th when I was trying to with draw from the ATM and the money did not come out I went inside the branch waited for my turn then ,I went to Sonia before she attend my issue she was telling her colleague how stupid the customer she assisted as I qoute her her words ,What a dummy I was assisting , then I explained what happened she then asked for my ID I shared with her to show that she was not paying attestion she asked he about the pending transaction ,I told her I dont have issue with that my problem is the money I was trying to withdraw with an attitude she said why didn't you say so I told her but I did she ask which ATM I was withdrawing from I told she ask me ATM number I told her I don't know and I don't know where to look for it then her colleague offered to take me to ATM to find the ATM number we came back only to find out the issue is reported .My question if she would ask me as a customer to give her ATM number where do I start Sonia doesnt deserve to assist any customer what happens to our old parents if as young as Iam got a horrible services from her I'm very disappointed.