Anonymous facebook comment falesly linked to my facebook page

Hoping I can get some answers here…

I was contacted by someone I dont know on facebook accusing me of writing nasty comments about them anonymously on a facebook group that we're both members of, its a community page were people post old and recent pictures of locals and the community, apparently I left some comments under a photo of this person. I had no knowledge of this person or the comments and when I went to look on the page I was blocked. I contacted the page admin who didnt believe me that I have nothing to do with the comments, he said he can see the anonymous profile they came from is my page and sent a screenshot, which did in fact show my page. These comments have nothing to do with me, I dont know any of the people involved in this. The person who contacted me sent me screen shots of the comments and theyre horrific! I would never in a million years post anything like that or say something so awful to anyone. I had no notifications about this post, the comments understandably had lots of angry replies and reactions but no notifications were sent to me, I checked my activity log and theres nothing there to say the comments came from my profile so im sure I havnt been hacked. If someone did log into my facebook I would get an email notification.

Ive tried to contact facebook about it but I cant get any reply, its impossible to speak to an actual person.

Has anyone heard of this happening before? Ive googled it but cant find anything.