No response from customer service

I recently opened a new account however it was not the correct account I need. I went to the branch and I was told that the account type can be changed however they did not do it at the particular branch. The lady lodged a request internally for it to be changed. This was three weeks ago. I have lodged an enquiry on the fnb website and the automated response said that I will be contacted within 24 hours. This did not happen. I have emailed care@fnb several times without getting any sort of response except for the normal automated one stating that I will be contacted soon. This is very bad service especially when I am thinking of changing to fnb permanently........ What do I do now?? Fnb you do not respond?