Call centre agent not keen to work and assist as he's suppose to, confirms wrong info

I have always thought Nedbank was a very good bank as I have taken a few finances with them, but their staff seems to be of no good to clients. I called the HL department to query if my husband has honored our repayment and spoke to Sphamandla who asked me questions and the issue came when he asked for my cellphone and when I confirmed it he said it was not correct. I tried to reason with him to make him understand why it was important to check if my husband paid and he didn't seem interested to help and sent me to their manual authentication centre and to my surprise there they had my correct number and they noted that the other number Sphamandla kept saying was my number on their ssystem was listed as previous and not current, so my question is why do people go to work if they not going to show any sign of interest to assist clients, to begin with he was at fault by telling me about a number I have not used for more that 10 years as my current number, Nedbank can your staff start showing interest on their work, what Sphamandle told me was utter nonsense and you should stop keeping old numbers if one has not confirmed as their current number and maybe Sphamandla needs some spectacles to read on his computer because he just confirmed that you have someone else's number on my profile and that scares me a lot. All his nonsense argument for nothing when he is the one in the wrong or your system, I cannot be penalised for your system errors why keep a previous number that I have not used for over 10 years?? Someone clearly is getting all my bank messages, the call reference ***3