Overcharged by Royal Partners International for service

I want to acknowledge that Royal Partners International has attempted to resolve this issue. However, the solution they're offering (a $29.90 store credit) isn't adequate considering I paid $29.90 for a microwave that never worked properly.

Dear customer, I am reaching out regarding your recent complaint about our loyalty program. First and foremost, I want to extend my sincere apologies for the frustration this situation has caused you. As the Senior Customer Representative at Royal Partners International, 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 $426.83 to your original payment method 2. Added a $426.83 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-B79B48DD 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, Avery Harris Senior Customer Representative Royal Partners International