To go above my manager?

[SmhShakingMyHead]

Short summary, I work in a department that's split into two teams. One woman on the other team started spreading disgusting rumours about me and tried to segregate me from the department.

I brought it to my manager who then told her manager but nothing happened after that. I wasn't given feedback at all. I'm not even 100% anything was said.

My managers manager runs an open for session. Aibu to discuss it with them instead?

Can you put in a grievance to HR?

Certainly raise it given the opportunity. Nip it in the bud. Something similar happened to me via a female colleague and I am still dealing with people thinking the rumours were true as people just accepted it as plausible. I couldn't address it up the chain as the rumour involved up the chain.

Tbh I wouldn't have the first clue how to do that.