Bennett Read Microwave Oven Rust Problem

Ten months ago, on the advice of the local Makro salesman, I bought a BENNETT READ 28L DIGITAL MICROWAVE OVEN. During my discussion with the salesman, I informed him that I had always purchased LG Microwave ovens. I stated that their magnetrons were a problem and that rust was another issue with that particular make. Hence his introducing me to Bennett Read. Well to cut a long story short, I took it back in for repairs as it is full of rust in the well of the unit and on the roof. It does have a 2-year warranty after all. Today Makro customer service contacted us stating that the condition was caused by possible water spillage and that I had to pay R135.95 for them to continue with repairs. Never in all my years have I seen the inside of a microwave oven rust so fast especiall since this machine had a special coating to prevent rust. Every time a microwave is used, it generates steam inside, and under normal circumstances, leaving the door ajar after use is enough to dry it out. What does Tevo expect from customers, that they dry it out after every use> I seriously think that this brand of appliance is prone to rust and strongly advise potential customers not to buy Bennett Read appliances. I'm nearly 70 years old and still learning. Shame on you Tevo/ Bennett Read.