Terrible treatment

So I go into the PEP appliance store In Elarduspark and the mngr is at the counter. I say:" sorry to bother , but can I pls get a balance check on my Bank card". (Did it also a few days earlier when loadshedding was running and ATM was off.) My leg has a BIG burn wound and it hurts to walk so I didn't want to walk all the way to the other end of the center to get to the ATM. So the mngr says She will help me this time, but not again. I ask her why she said that and she said:" Who's card is that? Is that your mother's card that you stole?" So I tell her NO it's not and my phone was ****** so I cant just check there. "No, that's probably a ****** card and she wont help me again" Now This is unacceptable for a few reasons. 1) I am a 42y/o man, and I dont have to explain myself to someone like that! 2)My mother is deceased. Has been for many years. 3) How can she just assume that I'm a *****? My looks? I was busy working so I was dirty. 4) Why is the service offered if they are going to give me hassles when I want to use it..? This was a surprise and I just said:" ag dont be like that", with a smile on my face. But is that how I should be treated.? It's a small thing and I doubt I will even get an answer from anyone regarding this. But I just feel wronged by this mngr who thinks she can speak to me like I'm one of her kids..!