She is giving her friends my contact numbers

I am a disgusted by the actions of your employee Tshepiso who works @ cell c randburg square, she told me that she wants to speak to me then i went to the branch to see her only to find out that she is involving herself in my personal life. I am a customer not her friend and she even gave friend my cellphone numbers without my approval how come? Now iam receiving sms she must give a valid reason as to why she gave the lady my contact numbers and is this allowed in your company? If it is allowed i want to know why is it not in the contract i have with your organization.