I'm afraid you can't stop paying the bail bondsman. You had a contract with the bondsman. The basic terms were that if the bondsman got the person released, you would make the payments. The bondsman fulfilled his end of the bargain, you must now fulfill yours. The fact you have issues with the person who was bonded out changes nothing with your agreement with the bondsman.

You can ask the bondsman to petition the court to revoke the bond. The court can then decide whether the bond will be revoked. Keep in mind revocation will not relieve you of your obligations to still pay the bondsman.