Poor assistance

I’m so hurt, I sent my sister to go with my grandmother to Capitec Bank at Osizweni Theku Plaza. Since she is old and have a heart condition l asked my sister to accompany her cause she doesn’t know anything, she never went to school, as we speak a guy who is assisting at the door by a name of Sfiso refused for my sister to go inside, for god sake I’m even trying to call my grandmother she doesn’t pick up cause sometimes she can’t hear her phone. She is now inside alone. Not even knowing what she’s going to do there, can someone please attend to this matter agent