How can i get juveline record in lexington ky ?

well this is the deal. im now 27 years old i was arrested when i was 17 years old . i need those records and i now live in florida ive called several times to the police dep and juvenile courts. they told me that the records have been destroyed theres nothing under my name but i need those records. for immigration purposes and they wont take no for an answer what should i do ???? y already have a the criminal background and police record check came back clear from them but they need a letter from them saying those records have been destroyed this is driving me crazzyyyy!!!!! any help would be appreciated