Disrespected

I went to Africanbank mall of the North polokwane on the 30 March to do my card, my phone rang and answered informed the person that was calling that m in the bank can't talk, the lady working in the bank yelled at me telling me why I didn't ask her for permission before answering the call, I didn't know what to say to her I just apologized, she didn't stop told me that I don't have manners, there is a sign outside why didn't I follow that sign, I continued to apologize and told her that the reason I answered I wanted the person to know that where I am I can't talk, she told me that I lack respect, I was with my husband and my daughter they saw they heard that the lady just wanted an argument and they used sign language thus telling me not to react. I am still asking myself if African bank train it's people, I mean if someone says I am sorry I think it should end there, that lady was in a fighting mood I don't know what could have happened if I was like her, I didn't even say thank you after she gave me my cardm, was so irritated, she addressed as if I was her little girl, no respect, no professionalism, rude.