Overcharged by Chef Catering for service

The situation with Chef Catering has gotten worse. Now they're claiming I never purchased the installation service, despite me providing the receipt and reference number REF-D869C996 multiple times.

Dear customer, I am reaching out regarding your recent complaint about our design service. First and foremost, I want to extend my sincere apologies for the frustration this situation has caused you. As the Senior Customer Representative at Chef Catering, I have personally reviewed your case and have spoken with the team members involved. There appears to have been a miscommunication regarding our service guarantees, and I take full responsibility for this oversight. I have taken the following immediate actions: 1. Processed a refund of $370.26 to your original payment method 2. Added a $370.26 service credit to your account for future use 3. Implemented additional training for our staff based on your feedback Your case has been assigned reference number REF-D869C996 for any future correspondence. Please allow 3-5 business days for the refund to appear in your account. Thank you for giving us the opportunity to address this matter. Your feedback helps us improve. Sincerely, Jennifer Walker Senior Customer Representative Chef Catering