What have you been sent? Some other customers are likely on premium packages paying more per month?
Regarding the security issue - have you changed the settings as described Here
One reason a ‘lower’ security setting is there by default is to cater for legacy devices that some users have.
In what way is it not working? Can you elaborate.
To be honest if you want newer and better wireless kit you’re probably better off buying your own and using the hub in modem mode. That’s what many of us ‘existing customers’ do.
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I know a bit about Wi-Fi, Telecoms, and TV as I used to do it for a living but I'm not perfect so don't beat me up... If you make things you make mistakes!