Rude call centre agent

I had the worst experience ever with a call agent from this business they are handling my credit card which unfortunately due to the passing of my father I am one payment behind this agent calls me on a Saturday 13h40 I asked her how can u be bothering clients on a Saturday she has a very bad attitude and get ****y and rude to me over the phone then addresses me by my lady and the more I ask her either address me by my name or miss she continues because she can hear it’s upsetting me. This agent has no proper experience in speaking to clients she might be having a bad day but don’t take it out on others if she doesn’t know their circumstances. I then ask her to speak to the manager she keeps me on the Like for about 15 minutes then comes back and says they are all busy and no line is available if this is the business Standard Bank is using then the budget Must be low I refuse to ever speak to anyone from this business and I’m strongly contemplating taking it public that was by far the worst Call ive ever received it has ruined my entire day. Thank you to your untrained rude employees