Wrong tickets received

I bought 8 tickets on line yesterday 21 November 2017, but to my surprise when I received the tickets via email they stated that I bought them on the 5th July 2017, to add another problem I received 15 tickets instead of 8 tickets! These tickets are valid for 30 days therefore I called theirs office yesterday and today, only to be told the same thing that Lianda Costa is not at work I must call the following date. Does this mean only Lianda can help me, do I have to wait for her before I can have my visit to uShaka? She is forever not available. I need these tickets to be rectified urgently or my refund to be processed urgently! Whay have a system that does not work properly yet we have to struggle and wait for "Lianda" for their errors to be fixed. I am very disappointed.