Try:
App/Billing/Manage your bills and payments/Change how you pay
Mike
EE Fibre 900 via SH+ with 2 Extenders, EE TV Pro & Mini boxes, 2 EE SIM's only, all originally BT, and wishing it still was.
LG Oled, Denon/Cambridge Audio 7.1, Panasonic 4K player, Apple TV 4K