Price wrong Three times is no mistake

On the 09/06/2015 while shopping at Checker at Cresta Mall to purchase 5 items. Upon getting to the pay point it turn out that three items were incorrectly priced, which would be fine if this was told to me in my own language (ENGLISH) however this was discussed among the lady at the till and the supervisor. As I promptly butted in and asked if there was a problem just to be told that I had picked the incorrect item (THE ITEM IN QUESTION WAS PLACE IN THE INCORRECT PLACE ON THE SHELF CLEARLY MARKED WITH THE PRICE) this being the third item priced incorrectly I asked to speak to a manager and it turned out that this had to be a point of discussion with the whole staff to get to the truth - I stepped away for a second to get the item and upon turning my back a staff member (WHO WAS NOT INVOLVED IN THE INCIDENT) accused me of LYING!!!! as a customer that is appalling being spoken to or about like this- the manager just stood by and said nothing regarding this issue. THIS IS THE THIRD TIME THAT I HAVE HAD BAD CUSTOMER SERVICE FROM CHECKER. I AM DISGUSTED AND ANNOYED. SOMETHING NEEDS TO BE DONE REGARDING TRAINING FOR BOTH STAFF AND MANAGEMENT.