MEDIOCRE SERVICE

I went to ackermans in kolonnade shopping center and saw a beautiful block heel shoe displayed on the floor and went to pay for it, when I got the tills the cashier said the code is none existing on their system. Supervisor by the name Petunia was called to adress the issue and she said unfortunately there's nothing they can do and they will give the shoe to charity. I then spoke to The Manager and He said they were supposed to remove the stock from display unfortunately they had a lot of paper work and it was not done so in that case since the code is none existing they will the shoe to charity. Why is the store making their problems mine? The customer pays for what they see but in this case I was denied my rights. They have a very bad service.