During sapthami tithi, offering 7 types of food in banana leaves for poor and worshipping saptha matha and saptha kannigas will remove any enmity between anybody like parents and children for any reason or between any people who are in business as 7 types of rays from sun are specially provided on this day.Banana leaves have mithira reka as referred by siddhars. Good longevity with peaceful life is provided if one worships this way.
Goddess aathiparasakthi is referred as santhoshi amman as saptha kannigai worshipped her when she did penance for getting the blessings of lord siva. After getting blessings of lord siva this saptha kannigas were blessed and are called as saptha mathas.
Thanks to agasthiar archives.