Disgusting service

I have been trying to get hold of them for over a week now - my insurance on my Iphone xr is R 405 a month my son has just insured his brand new Iphone 12 and it is costing him R 232 a month and my daughter who has the same phone as me and who insured her phone before me is paying R 330. All I would like is for someone to explain how they work out the premiums because this doesn't make sense to me at all. They keep telling me they will get back to me before close of business - presently I have waiting for a Manager - Lerato and I have been holding on the call for 43 minutes - if this is customer service I really don't know anymore. Beyond frustrated customer.,.,, and this isn't even to claim for me phone can you imagine when I have to do that !!!!!