Rude, unprofessional and possibly not compliant with POPIA?

Called by an agent on 23 February 2022. Asked for detailed personal information regarding my MTN account (which by the way was up to date!). When I asked for more detail on who was asking and why, they simply hung up. Incredibly rude and I am so concerned about what they are doing with my information. This does not seem like a trustworthy company at all!