Taking blame for store error

I went into a total sports store in Uitenhage to laybuy an addidas tracksuit. When i took the tracksuit it was the pants and the top that was on one hanger and was advertised for R799. Today i was called telling me it was a error that it was not supposed to be together. Its R799 for only the top. I feel its unacceptable as it was not what was displayed and now i have to take responsibility for something your store has done wrong. I will not accept this error. The laybuy was done for full tracksuit, meaning the cashier also made error by not informing me. This is unacceptable and i want that full tracksuit for R799 as shown on the shelves. You can contact me on *** for additional information... This will be the last time ill ever visit a total sport shop