Tennessee And Another Open Child Support Case

I am the non-custodial parent and I currently reside in FL. My children have been with custodial parent since 1997. A child support order was established in Ohio at that time. Since then, I have paid them on time, as ordered. Custodial parent has moved (first to Arizona, then Tennessee) since that establishment, and created child support orders in each state, claiming non-payment, instead of transferring the case to that state. Now, I have had numerous collection calls, letters, and harrassment on my job from these collectors, and it's rediculous! I wrote several letters to the secondry states, letting them know about the situation, to no avail, until about a year ago. Arizona finally acknowledged their mistake, and forwarded all credits (taken from my tax-offsets) to the original state of Ohio. I have appealed to Tennessee, but they have ignored my requests and demands. I have an upcoming appeal on May 24th, which has to be done by phone due to my inability to be there in person. Meanwhile, Ohio has a credited balance for the child, and if Tennessee had transferred the order, instead of creating their own, Tennessee would have to acknowledge their mistake as well, and the credit would be more than enough to be paid in full, past the child's 18th birthday.
In essence, I believe that if there is a current Child Support order in place, it would be wise of the courts not to establish another, and perhaps look into the facts of each case before them. I feel I have been put through pure torture, as I have been labeled a "dead-beat parent", and I am not! I have been embarrased at work, harrassed on the phone at home, and all because of incompetence on behalf of the Tennessee Child Support system.