Master Builders Development failed to honor their commitment

It's now been 12 days since my initial complaint, and Master Builders Development still hasn't addressed the core issue. I've received generic responses that don't actually solve my problem with their technical support package.

Dear valued customer, Thank you for your complaint regarding the blender you purchased on April 16, 2025. At Master Builders Development, 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 $438.63 2. A replacement blender with an extended warranty 3. A store credit of $438.63 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-26DD3E35. We value your business and hope to restore your confidence in our company. Best regards, Alex Johnson Service Excellence Manager Master Builders Development