What should I do when the police won't help?

I need some advice relating to what my next step should be, regarding a false police report that was filed against me. The files were charged in Gatlinburg by a woman who I used to be acquainted with. Long story short, she filed a police report stating that I had stolen checks from her, and used them in three different counties, one in my FL hometown as well. This was later proven false, with the investigating detective asking her to provide bank statements showing where these checks had been used. When she was unable to prove these items, she admitted that her and her husband, (who is in the military no less), had concocted this story to get out of paying back a loan my partner and I had given her. The problem is, once the claims had been proved false, the investigating detective let her off with no charges for filing a false police report. Instead, my partner and I were told, to make arrangements with the woman for the loan repayment. We contacted her and made her aware, if she did not pay back the loaned money on June 1st, 2011, that we would file charges against her for the false police report. Today is June 6th, 2011 and the loaned amount has not been repaid, the investigating officer has not returned any phone calls for going on the third week now, and I am at a loss of what the next course of action should be. The detective has all documents submitted by my partner and I, relating to the case and should have no problem assisting us. Instead, another day goes by where Justice is NOT served and another person gets away with a crime. You want to know what the sad part about this is? When I was in my hometown last month, a 10 year old girl was arrested BY THE POLICE for filing a false police report against her music teacher, saying he molested her. This man lost TWO years of his life because of this. So I'm to understand, the police will arrest children for committing this crime, yet an almost 40 year old woman is given leeway? Any advice relating to this post would be greatly appreciated, since I obviously cannot expect any help from the police department handling this issue.