Staff unwilling to assist

I swiped my cheque card to purchase tickets at Nu Metro on the 18 March and the tickets did not print, the manager then supp**** me with 2 readmission tickets and informed me that i could use it at any time for any movie at any Nu Metro. I took my grandmother to watch Kapoor and Sons on the 23 March and when I wanted to use my readmission tickets I was told that it did not apply to new releases which is not what I was told when the tickets were given to me. The manager on duty did not come to the help desk even though I requested to speak to them about it. The clerk assisting told me to buy tickets for the movie and use the readmission tickets another time which is unacceptable as i had already paid for the tickets. They were not willing to assist in any way and I was told that the movie was full if I wanted to use the readmission tickets but if I bought the tickets I would be allowed in which does not make sense. I then had to take my 77 year old gran to see Kung Fu Panda and missed half the movie due to the delay caused by the staff who were not helpful at all. when I walked out thamsanqa asked for my details but no one has contacted me to date. this was not free tickets i had