Appaling online Customer Service

I was double charged on the 15 September 2023 at Burger King (Norwood) due to a technical error with their machine. I was informed that the system will utomatically reverse thd double payment, to date nothing. I sent an email to *** and was informed to get a bank statement. For such a big company, how iss it that their system can't pick up the double payment for the same order,very disappointing. I should incur extra costs for what? For the fact that they have not responded to any of people's comments on this platform shows the arrogance. Customers make or break a business and businesses come and go.