They are calling you out for plagiarism because your company is a plagiarist. It's just as clear as seeing a person who is burning and telling them that they are on fire, or a person who is dead and calling them deceased. You do not have the right to lift entire articles from other's sites, even if you DO give attribution.

If you as CEO have so little common sense that you don't even know what plagiarism is, then you need to step down quickly before you open your company up to lawsuits against people who actuallY DO have the money and the time to pursue a suit.