Microwave, unhealthy!

Bought a microwave a few years ago from Makro. Just before covid, I noticed that the inside of the microwave was looking like it had not been cleaned for ages, upon closer inspection, I saw that the bottom and sides (metal or similar coating) was just peeling and rusting. I put something on Facebook, they asked me to private email them, which I did, they eventually rep**** saying that if it's not a ceramic inside, then the microwave isn't covered. No where in the manual does it state this. I mailed them telling them so, got an email back saying what do I want them to do. I rep****, saying, I want a new microwave, they have never rep**** to that mail and I have re sent it a few times. My main issue is, surely, cooking in these conditions is not at all healthy! Will never purchase anything that they sell again!