Complaint against account administered by capitec bank

My name is Fezeka Gadu and I hereby write to report a person who is a CAPITEC CLIENT with account number *** account holder is Mr/Ms Mthembu and she ****med me on joining her investment called Capstone investment and I paid the amount of 4500 in her account nd she promised if it will.return with 100% interest after 8hrs.Nearly that time she blocked me on the group she formed and she blocked me on her whatsap.I am.also a capitec client I would be glad if capitec would assist me in this matter and we are a lot of members she ****med and who report this.My email adress is ***nd my cellphone number is ***