It is a matter where you have to speak with them and reach an agreement on how much to trim so that you are both happy.
It appears that it has not escalated to the point of no return and you should sit down with them and try and reach a compromise.
If you cannot, then it would be a matter that will cost you both money going to court and completely destroy any relationship that you have.
It may be that a community legal centre may be able to assist with some mediation but you have to speak with them and work with them.
I am surprised they did what they dud without consulting you as well.
This is your only option if you wish to resolve it without too much cost.
I hope this makes sense and is of assistance. If there is nothing further
thank you for using my services.
If I have missed anything, or you have any further questions please let me know
If there is anything else in the future please do not hesitate to ask.
Please do not forget to leave positive feedback.