Change of banking details confirmed via email but not activated on the system

I have changed my banking details for paybacks and received email confirmation that it was changed on 17 Dec 2019. Yet, on 9 Jan 2020 I still received both my healthy food and shoe booster paybacks in my old Absa account. What should I do to get this corrected. Contacting Discovery is near impossible. No email addresses are provided. When I phone Discovery there is no option for Vitality. Please change my banking details on your system to Standard Bank asap and confirm once done!