Warranty claim denied by Smart Goods Exchange

I've received an email from Michael Lewis at Smart Goods Exchange offering a partial refund, but I believe I'm entitled to a full refund given the circumstances. The athletic shoes was clearly defective from the start.

Dear customer, I am reaching out regarding your recent complaint about our upgrade plan. First and foremost, I want to extend my sincere apologies for the frustration this situation has caused you. As the Customer Advocacy Manager at Smart Goods Exchange, 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 $133.41 to your original payment method 2. Added a $133.41 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-2262F6BF 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, Karen Martin Customer Advocacy Manager Smart Goods Exchange