Bests & Worsts Reviews from Amazon

I brought this water boiler on 10/22/2017 and have used it less than two months. When I tried to clean it the first time this morning and I see the bottom of the inner container starts rusting. According to the product description, it says "The material of the inner container is stainless steel." If I understand correctly, stainless steel does not get rusting. I thought this is a good brand for water boiler and it is going to last for a while. Trying to figure out what to do next.