I can't imagine you get your money back here. Without seeing the documents you signed -- because you must have signed documents -- no one on this message board can offer you good advice. My educated guess is the only way you get out of this obligation is to sell your interests!
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but insted need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights.
Attorneys cannot give advice about contracts that they cannot see. I too doubt that you will get any money back whatsoever.
R. Jason de Groot, Esq.,
Your purchase/financing/layaway documents undoubtedly cover efforts to terminate the agreement.
You should read the provisions, but the magic 8 ball says you likely won't like what you find there.