Contract upgrade

1. I requested a 'call-back' on morning of 6 April and am still waiting !<br> 2. I need to understand the difference between uChoose Smart S and Smart S - is there no 'contract comparison' available ?<br> 3. Why has the upgrade price for the Nokia 830 Smart S package changed from R299/mth on 6 April to R329/mth today (7 April) ? Prices are only due to change on 1 May.