Been there and done that. There aren't any silver bullets. Just some random advice.
First, pick your battles. You can't fight every one at the same time.
Second, DOCs and Email are your friend. Don't bother with Slack/Teams. If you came from an important meeting, reply to everyone who attended the meeting and CC and BCC people, and write your version of meeting notes and focus on what was agreed upon and what questions remained unresolved. After several emails like, this copy/paste them into a Word document that you save. I have shut down the worst offenders by simply re-sending the same email I sent six months ago.
Third, be prepared for the blowback. I got screamed/yelled at/for days by executives. Eventually the truth will come out. But it might take years.
First, pick your battles. You can't fight every one at the same time.
Second, DOCs and Email are your friend. Don't bother with Slack/Teams. If you came from an important meeting, reply to everyone who attended the meeting and CC and BCC people, and write your version of meeting notes and focus on what was agreed upon and what questions remained unresolved. After several emails like, this copy/paste them into a Word document that you save. I have shut down the worst offenders by simply re-sending the same email I sent six months ago.
Third, be prepared for the blowback. I got screamed/yelled at/for days by executives. Eventually the truth will come out. But it might take years.