***** and incompetant staff

A ********** account was created with my name and after months of communication and confirmation that the problem was resolved by Carol Andrews on 13 June 2017, I found out that it was still not resolved till date (19 August 2017) and that my credit rating has been affected tremendously! I can not get a home loan nor car financing due to this, which has placed high stress and anxiety in my life. I phoned the ***** department and spoke to Ruchelle and she said she would sort it out by Friday the 18 of August 2017 and requested that I give her a call to follow up (which I think should have been her job to call me, since this problem has escalated). I tried calling her 6 times on Friday with no answer. This situation has reached a point where I want to take legal actions against the company! Can someone advise me the way forward?!