No remedy conferred by this chapter upon any holder of refunding bonds, or any trustee therefor, is intended to be exclusive of any other remedy, but each such remedy is cumulative and in addition to every other remedy and may be exercised without exhausting and without regard to any other remedy conferred by this chapter or by any other law. Every substantive right and every remedy conferred upon the holders of refunding bonds may be enforced and exercised from time to time and as often as may be deemed expedient.