My question involves child support in the State of: Georgia

My fiance's divorce finalized in 2013. During the process his ex lied about her income and intentionally left utilities unpaid so she could tell the judge she could not afford to keep the lights/water on based on her own income. He was ordered to pay $950 per month as well as the mortgage on the home where his ex was living (an additional $1,100). In February of 2014 he was laid off. For a period of about 5 months he continued to pay the mortgage as well as his daughter's $950 private school tuition. But because he was paying the school directly his ex took him to court stating that he was not paying her and that he owed approximately $4,800. The Fulton County Court determined that he was not in arrears as he was paying the state-mandated amount and the money went directly to the care of the child. They recommended however that moving forward he pay the tuition amount to his ex and she could pay the school. By this method he would have a paper trail of direct payment to her and avoid conflict in the future. He began doing so and his ex promptly pulled the child out of the private school and started pocketing the checks.

The court only required that he pay for the mortgage for two years at which point she either had to take over house payment or move. The mandate expired in 7/2015 and she elected to move. At this time she took the same arrears complaint she had made previously directly to the DHS. Since July he has been receiving threats regarding his driver's license and wage garnishment. He has not missed a single payment to her since the initial complaint in 2014. He has twice requested administrative review with the DHS (allowable per their letters) and has not received a response. He has documentation to prove that this arrears claim is false but he cannot get anyone at the DHS to talk to/meet with him. Instead they have continued to escalate the process without regard for his requests. During another Fulton County Court session (this one in October of 2015 regarding another lay-off) he presented the judge with a copy of the documentation she sent to the DHS stating that he owed money which the court had already determined paid. The judge told him that it "wasn't his department" and that he would have to pursue the matter with the DHS directly.

So at this point he is stuck. No one at the DHS will answer his letters or phone calls and the court won't help him. How can he move this process along? I recommended suing her directly for making a false claim which has prevented him from finding new work (as a result of wage garnishment). My hope is that the court would require her to repeal her DHS complaint. He is agreeable to this but he thinks he may also be able to file a suit against the DHS for violating his due process. Complicating the matter is the fact that he wants to proceed with everything pro se.

At this point I'm looking for advice on whether a suit is feasible against either party. Better yet may be advice on getting through to someone at the DHS who can help the complaint get annulled. Ideally we would also like the state to take action against her for perjury. I am frustrated as this process has lasted six months without anything resembling resolution and is causing considerable distress to the family. Any recommendations and criticism are welcome.