Delayed delivery from Genius Success Campus

I've received an email from William Robinson at Genius Success Campus offering a partial refund, but I believe I'm entitled to a full refund given the circumstances. The dress shirt was clearly defective from the start.

Dear valued customer, Thank you for bringing this matter to our attention. We at Genius Success Campus take all customer concerns seriously and are committed to ensuring your satisfaction. We have reviewed your complaint regarding our t-shirt and have initiated an internal investigation (Reference: REF-3B575017). One of our specialists from our Customer Experience will be contacting you within the next 8 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, Richard Young Customer Satisfaction Coordinator Genius Success Campus Customer Relations