get your facts wrong

"I'm afraid you've got your facts wrong," Volksmann replied calmly.

You've got your facts wrong.

Today, people are horrified by spelling errors, as if spelling mistake could compare with getting your facts wrong.

"And don't get your facts wrong."

Your ability to write and argue is of little avail if you get your facts wrong, fail to find the relevant authorities, rely on a statute that has been superseded or a case that has been overruled, or simply misunderstand the authorities.