I stopped buying books from amazon since 2016. Bought an 80$ technical book that came as if it was printed from a pdf. Equations are barely readable. I made a r

I stopped buying books from amazon since 2016. Bought an 80$ technical book that came as if it was printed from a pdf. Equations are barely readable. I made a review with pictures and no action has been taken. I have been buying from the local retailer since then.