It depends on the type of contract. Bankruptcy does not allow
someone to skip child support or separate maintenance payments, but
other contracts, such as revolving debt accounts are terminated. Be
more specific.
If you have hired a contractor to perform a service, refer to
the terms of the contract to terminate the contract and the
procedures to terminate based on the circumstances.
If you believe they are stealing, you should report the theft to
the police.
A bankruptcy (either 13 or 7) is filed by a person and is to
include ALL debts, not a particular contract.
You should speak with a bankruptcy lawyer to find out if you
qualify and what debts would be discharged or reorganized under a
bankruptcy.