BerlingerHaus pots 10ps Touch Stone Line Black

I bought the granite black pots from BerlingerHaus and two of them (10 parts) was broken on the sides. In the website and wrapping box was written, that is suitable to oven and for 220C. But in very poor and non-informative manual was written that you CANNOT use them in the oven and only use for maximum heat 200C. The pots are visually made very poorly and the price don't reach the quality as is declared. Not even talk about the quality of their website... You can find only good rewievs and the bad ones are deleted for sure. Never buy this ****!