There is a social media group and I noticed someone posted saying they had trouble getting paid from an employer. I work for the employer too and said I have found them to be dishonest. My manager saw this post and retaliated by posting that there has been multiple sexual harassment claims about me. I took a screenshot and reported this to HR. HR contacted me getting my side of the story. Now they want to have another phone call with me and for me to sign a confidentiality agreement saying I won't discuss the issue.
Why would I sign this? In my first call the HR advisor told me there hadn't been any sexual harassment claims against me. This was my main concern. Should I tell them they can drop their investigation?
I only work for this company a couple days per week. I've already spent over an hour dealing with HR regarding this. I don't want to spend a lot of time for something that I'm not getting paid for and don't know what the end result is supposed to be. I thought it would be simple to send them the screen shot but now they were asking if I could provide them with witnesses who might have seen the post on social media.
If I chose not to sign the confidentiality agreement, what's the best way to decline?
For an idea of what the confidentiality agreement says, it can be found here.
EDIT: in response to some of the comments, it is true that I asked a secret shopper for her phone number. My manager brought this to my attention a month ago but nothing further happened. It is possible my manager exaggerate a great deal and called this incident "sexual harassment" but in her Facebook post she said their had been multiple. Regardless, a manager shouldn't post this on social media. Hypothetically even if I did harass someone and their was a proven case against me, the manager shouldn't post that on social media.