ExH has said he will be reducing child maintenance by one third next year. He claims this is on the basis of his earnings, though has not offered any evidence to support this. Also the figure he bases his income on is basic salary only but he works in a job where at least 50% of compensation is made up of bonus. Bonus is discretionary but he has always had one. The consent order in which maintenance was set (more than a year ago) set the maintenance by reference to his basic plus bonus in that year.
I would not object to a reduction in the maintenance if his total earnings actually supported it, but it is clear that that's not the case. Lifestyle points to far higher earnings. I've never asked for an upward review so I'm shocked that he thinks he can just tell me he's cutting it by a third next month.
What can I do, in legal terms?