I really need some legal advice because I'm so confused. Please help, I'm scared & not sure what to do.
I had a financial arrangement set by the court in May 2014 for child maintenance in the amount of 25% of my exh's net monthly salary (we have 4 children, but 3 children under 18, he has not contributed anything for the oldest since he left in 2013 as she's over 18 and at uni).
This 25% he has paid ever since, however I know this court order only stood for a year & was waiting for his next move ever since that year was up in May 2015. I thought he'd apply to reduce it based on the fact he lives with his new partner & her 2 children now. However, I didn't see this coming...
Yesterday I got a text telling me he has left his (professional) job & there will be no more maintenance until circumstances change or his new business becomes successful. He has set up a new business doing kids parties 
I phoned the child maintenance service who said that "he's lying, no one leaves a reasonably comfortable job" 
....but that if he has left his job all I'm entitled to is a tiny percentage of his benefits.
Is this true? Is there no recourse due to his deliberate deprivation of income? He definitely resigned & wasn't fired as I read it on the schools newsletter online (he was a deputy headteacher).
I'm going into my 3rd year of uni in September (I decided I had to increase my career options & income when he left so I started a university course) so I get child tax credits, child benefit & my student loan/bursary. But it's not a huge amount. I have the family home to pay for (that I bought him out of as part of the financial settlement) & his maintenance helped hugely towards the mortgage. I'm scared I'm going to lose my home.