BAD EXPERIENCE AND IDENTITY THEFT

My name is zukile and my ID number is *** and cell number is ***. While i was busy checking my credit bureau profile i realized that they was an active edgars acc under my profile, so i went to edgars mall of africa yesterday to enquire about that because the account i had with them was closed 5 or 6 years ago. The lady who was helping me there in the shop when she checked the account, i was shocked that another person was using my id number but the name, contacts were not mine. i waited there for over an hour there trying to sort out this problem with no luck, a person from rcs promised to call me at 5 before but nothing, what frustrated me the more being told that they need need to get hold of the person that opened the account, why do i have to wait for my name to be cleared, clearly this is identity ***** and i want to open the case, this is ruining my credit, a lady from rcs by the name of Yolanda couldn't even answer my questions and she was rude to me. I am not happy with this at all and how did this account being used with my id and even opened with one.