Warranty claim denied by United Medical Professionals Wollongong Holdings

I've received an email from Susan Davis at United Medical Professionals Wollongong Holdings offering a partial refund, but I believe I'm entitled to a full refund given the circumstances. The camera was clearly defective from the start.

Dear valued customer, Thank you for bringing this matter to our attention. We at United Medical Professionals Wollongong Holdings take all customer concerns seriously and are committed to ensuring your satisfaction. We have reviewed your complaint regarding our tablet and have initiated an internal investigation (Reference: REF-4FC5E225). One of our specialists from our Quality Assurance will be contacting you within the next 11 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, John Smith Director of Customer Success United Medical Professionals Wollongong Holdings Customer Relations