Unauthorised transaction / bank dispute

Typical aim: Refund of unauthorised payment
Be specific: dates, times, order numbers, names, promises made, and the resolution you want.
We’ll reference:
Acts & laws: Payment Services Regulations 2017; FCA DISP
Ombudsman/Regulator: Financial Ombudsman Service (FOS)
Guidance: https://www.financial-ombudsman.org.uk/consumers/complaints/can-help/banking-payments