Mail slot cover rusting and Econo Window just don't care

I had my porch enclosed by Econo Window in 2015. They installed a mail slot and cover in the aluminium door. The cover is starting to rust and rot away. I contacted them via email, phone, website. Eventually Malcolm called full of promises to remove the cover and send it away for repairs. This was over 3 weeks ago with me reaching out to them again and again. Nothing has been done yet and they just dont respond or call back. I am very disappointed in this company and wont be doing business with them again.