Faulty product

I received a Kambrook USB blender for a gift last year December, it worked for a very short period of time. I asked the person that bought it if they still have the slip they advised me no. I havd all the packaging and decided too go too the store he bought it from too ask if their is any way I can be assisted with a replacement of the same thing as the box show 12 month guarantee and I would like a working product. They refuse too help and just said u need the slip we can't help. Very disappointed in product and service I received at the store.