DAMAGED MICROWAVE OVEN

I purchased a Russell Hobbs microwave from GAme Keywest in May 2013. The paint inside the microwave is peeling and Russell Hobbs says it is up to me to repair it since the warranty has expired. Apparently it should be wiped every time there is steam. They are aware of this problem but no where in the booklet is there any warning about this. I used a Sharp micro for 20 years and had no problems. If Russell Hobbs is aware of this problem, they should be liable to fix my micro free of charge or replace it with a new one.I bought a Russell Hobbs because they have a reputation of good quality and look where it got me.