Persistent hounding

I was unfortunate enough place all my short term insurance with them for a year - baaaaaad mistake. Customer service is not in their vocabulary. I was unable to get any assistance on a burst water pipe or fallen tree claim and literally had to phone and nag them constantly to make any progress.

They responded by increasing all my premiums by 20% on my policy anniversary.

I finally got sensible and fired them as my insurer and now they won't lose my number. Their sales team hounds me regularly to try and sell me their shocking customer service and no matter how often I ask / instruct them to delete my personal information from their database I simply get ignored and hounded some more.

I have already had to block 3 numbers just today.

My next recourse is to report them on breaching the POPI act.