Small Business - Supplier does not want to warranty product

Hey Peeps!

I was hoping I could have a hand in finding the official rulings for what responsibilities a supplier has to a seller. My supplier is claiming that their 3 year consumer warranty started when my business bought the item not the customer. They are implying I need to cover this out of my pocket not them. To me this seems like a load of bollocks but I am struggling to navigate the official documentation to figure out if I am in the wrong or not.

My business is an official seller of this brand. As far as I am aware they need to follow their responsibility to help me provide a solution for my customers faulty product.

I would appreciate any insight. Thanks!