Has any experienced domestic violence after the separation for too many years to count?

I have a 15 and 17 year old son who I have raised since they were very young on my own. The problem is my ex has made my life miserable since the separation. I have had a crime commited against me on my birthday. I have had my ex use my sons to manipulate me and give me messages. I have had my ex try to hide his official income by working self employed and getting his income reduced to less than I earn. I have to go through of essments to get child support because his taxable income is not his true income. I am hoping that when my sons are past 18 that there will be and end to all of this. I have got to the stage where I avoid talking to my ex on the phone and not conversing by sms because everything he does is sly and I know his tactics. I hate to see my sons come home after seeing their father filled with stories from their father that are un true and manipulate the truth to try and turn them against me. I hate knowing that I have to stand up against myself.