Refund of extra amount paid.

I took out a vehicle with Flexi club though avisbudget in November 2024. The monthly subscription has also been on a monthly basis. On March 20th, 2025, I accidentally paid my subscription twice. I then called Flexi club and informed them of this. Flexi club then sent an email to Avisbudget for the one amount to refunded. The email was sent on Thursday 20th March 2025. To date no response form Avisbudget. I also sent 2 emails directly to Avisbudget and still no response. Can you please arrange for the extra months subscription to be refunded asap.