My question involves child support in the State of: Ohio

Ok, I'll try to make this short, but there are alot of details, most of which will be left out. If any details need included, please ask.

My ex fiance and I planned our son together, and while 5 months pregnant, I discovered she was a totally diff person than I thought (not because of her mood swings but the whole cheating thing kind of gave it away). Anyway, the split got very ugly, and she decided to give me the whole "take both of us or neither" thing after I told her I wanted our son. So I decided that court would sort it all out and be fair. Boy was I wrong.

A year later, we finally had a court date to establish child support so I could see my son. I WRONGFULLY assumed giving support meant you automatically got visitation rights. Nope. At the hearing, we were both supposed to bring pay stubs, and she was supposed to bring receipts for diapers, rent, daycare, and a whole bunch of other stuff. I show up with my stubs, she shows up with literally nothing. So the lady who decided my fate did some calculations and gave me a number, $870 a month. It seemed high and she explained it was because ex paid so much for daycare a month. SUPPOSEDLY $750 a month. However, I recently found out she withdrew him from that daycare facility and has had her mother babysitting for the past two yrs. She KNOWINGLY never reported the change.

My question is this.

1. Is that considered fraud of any kind?
2. Will I ever be able to prove somehow that he has not been there for TWO years, and if so, how?
3. How the heck can I get my cash back, or at least put towards my arrears that are way too far behind, seeing as I bring home literally $48 a week due to him having to be on my work insurance AND $870 a month?

Any help would be greatly appreciated, as my wife and I are pregnant with TWINS (Amazing!) and I would really like to be able to support my wife and children rather than my cheating ex. Thanks again in advance!!

--Tolliver