An appeal need not be formal, but it shall be specific as to the issues which continue to be in dispute and shall set forth the Local Mental Health Service's contentions as to those issues. If an appeal fails to state the specific grounds upon which it is based, the Local Mental Health Director or authorized agent shall be notified that it does not comply with the requirement of this section. Within fifteen (15) calendar days after the date that such notice is received, an amended appeal may be filed. If, within the time permitted, the Local Mental Health Director or the authorized agent fails to amend the appeal, the appeal shall be dismissed.