bridge of POPIA Act and customer confidentiality, defamation of charactor

Botshabelo Best Home Electric express, a staff member by the name of Moleboheng sold a very expensive fridge to my very old Grandmother, my grand mother she failed to make payment as all her sassa money was going to the installment, i decided to help pay installment, so now because the account had arreas, this lady called Moleboheng came to my work place with two guys wearing disguised masks, demanding that i give them R950 for the installment, i told them that im not yet paid but i am going to help my grandma pay when i get paid. she was so loud and telling all my family business to strangers passing. 1st that is not my account, im only going to help my grandmother pay, 2nd she gave an elderly person an expensive fridge that she does not even need, which takes all her sassa money and leaves her with nothing. 3rd she is very rude she does not have customer confidentiality because she approached me on my work place and started telling every person my business. that Moleboheng ladu from Botshabelo is not good for the business she does not know how to speak to customers