RCS GAME LOANS DEDUCTED MORE THAN THEY WERE AUTHORISED TO AND REFUSE TO PAY BACK THE MONEY

I have a loan with Game Loans (RCS). I agreed to a debit order to pay the premiums, but RCS deducted more than they should have. After complaining via and email on 21 August 2023, RCS took a week to reply, but acknowledged the mistake & apologised for making the additional deductions & promised to pay back the extra deductions. Since then, nothing has happened. I have written numerous emails and called on numerous occasions & all I get is that it will take between 7 and 14 days, or "it is loaded and it will be paid by Wednesday", or "it will be paid by Friday"