Impatient and rude manager

On the 12th February 2021 around 12:30 pm I called the store to enquire about any valentine's day specials the shop might have. The Lady on the phone transferred my call to James. At the time I was not aware that James was a male as I was not told who I'm being transferred to. When James answered the call, I mistakenly addressed him as "Mam". He quickly corrected me and I apologized explaining my mistake. James interrupted my apology by making a snotty comment saying that I should have listened more carefully to his voice. I tried explaining that I may have missed that due to the bad network coverage on that day and that not all deep voices are from males. Again he interrupted me and the whole conversation descended into an argument. I became upset and accused James of being rude & he started shouting at me. Never have I been so humiliated and belittled over the phone. I told James I was not interested in talking to him and told him I'd raise his behavior with Checker's management. I called again a few seconds later to ask for the Manager. I was told that the Manager was on leave and the lady who answered the phone didn't know when the Manager would return. To make things worse, I was told that James was the acting manager while the normal manager was on leave. This made me lose hope so I took my business to Food *****'s market instead. As customers we sometimes make mistakes but that doesn't give anyone the right to belittle us especially when I try to apologize for the mistake. I'll never forget this experience! Completely ruined my day.