Dealing with bullying behaviour

I am wondering if someone could give me some advice. I don’t reside in the UK or USA so the laws are slightly different. We have a building administrative manager within a complex of just 4 units. The other units are dominated by a family – father, mother, daughter and son. So, the family controls the building administrative manager although, by law, they are supposed to act fairly and equitably across all owners and residents. Over the years, being a minority of one, I have always been bullied by the family. They do this directly and via the building manager. I don’t cower down to bullies and in the past, have taken them to the tribunal for their actions and won. Recently we have this new building manager and again she attempts to bully – either on instructions from the family or in an attempt to align herself with the family. This building manager, call her Bella, asked for her contractor to go up to my unit because of a leak to a family unit below. I allowed her contractor to my unit and did not think more than that. Three weeks later, Bella gave me a bill for $2,500 and said that I urgently need to pay the bill. No forewarning, nothing. I checked with the regulator and it is against the law for her to interfere with my private property, without my consent. I communicated this to Bella and she has gone all quiet. I think she realises now that she may have got things wrong and her bullying has backfired. I can always file a formal complaint against Bella and the regulator will investigate. This will be a mark against her. Question is this - should I? If I did that, I would put her offside even more. However if I did not do that, she may carry on bullying. My aim is to stop the bullying. I would therefore appreciate any advice. Thank you for in anticipation.

Hi, Ritachin7- and welcome! Apologies for the delay in response, however, please be aware that you're 100% welcome, as with any forum, to help yourself in chatting to other Original Posters (OPs/thread-owners) on their threads - or, better yet, giving your opinion whereever you can relate to their own problam (or even imagine being in their boat). Meanwhile, I'm duplicating this message to all whom likewise are still waiting, that they are perfectly free to do so on yours. :) Soulmate Moderator-Advisor

('Problam' - haha - sorry - problem, obviously)

FYI, I'll be posting late tonight and most of tomorrow. Please can you give me a little reply so I know you haven't 'abandoned queue'?