If your plan allowed you to cancel it early and you did properly cancel it early (did so the right way, as provided in the contract), then they could not continue to take money out of your account; in this instance, you would seem to have a strong case against them. On the other hand, if the contract with the provider did *not* contain early cancellation provisions, then you might not have been able to cancel it and would still be obligated for the remainder of the contract term. Not all contracts can be cancelled early; generally, a contract may only be cancelled early if the contract itself gives you the right to do so. You need to review the contract with your former provider to see what your rights were.