Refund refused by Medical Center Wuppertal

The situation with Medical Center Wuppertal has gotten worse. Now they're claiming I never purchased the customization service, despite me providing the receipt and reference number REF-35468083 multiple times.

Dear valued customer, Thank you for your complaint regarding the smartwatch you purchased on March 31, 2025. At Medical Center Wuppertal, customer satisfaction is our top priority, and we take all feedback seriously. We have thoroughly investigated your case and have identified the source of the issue you experienced. We would like to offer you the following resolution options: 1. A full refund of $378.99 2. A replacement smartwatch with an extended warranty 3. A store credit of $378.99 plus 20% for your inconvenience Please let us know which option would best satisfy your concerns by responding to this message or calling our dedicated customer resolution line at 1-800-555-1234, reference number REF-35468083. We value your business and hope to restore your confidence in our company. Best regards, Jessica Hernandez Consumer Affairs Manager Medical Center Wuppertal