Rusted Microwave, Shocking service

Defy South Africa need to work on their service and stop selling us inferior products. Our microwave isnt even 2 years old and it's rusted inside. When we approached the Defy salesman, he was defensive and told me it was dirt, not rust. He proceeded to tell me that it was my fault the microwave had rusted inside. I am deepy disappointed that a once-reliable quality brand has come to this.