Stainless steel Kenwood airfryer oven rusting health hazard

I bought a Kenwooed oven airfryer less than 2 years ago. Its still in good mechanical working order, but the whole interior has rusted, even though its supposed to be a stainless steel airfryer. No rust outside, but the whole interior has rusted. I cannot use it anymore as its become a health hazard. Kenwood used to be one of the top brands. I will never buy a Kenwood product again.