Summit Lab of Foundation refused to address issue

I've received an email from Charles Brown at Summit Lab of Foundation 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 valued customer, Thank you for bringing this matter to our attention. We at Summit Lab of Foundation take all customer concerns seriously and are committed to ensuring your satisfaction. We have reviewed your complaint regarding our formal shoes and have initiated an internal investigation (Reference: REF-3D928258). One of our specialists from our Quality Assurance will be contacting you within the next 9 business days to discuss this matter further and work towards a resolution that addresses your concerns. We appreciate your patience and look forward to resolving this matter to your satisfaction. Sincerely, Susan King Brand Representative Summit Lab of Foundation Customer Relations