Wrongly packed items

Went to hebron mall to a newly opened store i have shopped at Mr price but mostly for kids stuff ...i bought Bras there it was a set of 2 Balconette bras and knowing i can't return these i checked the hanger to make sure it the correct size and checked 1 of the bras which was correct size according to the hanger and i was satisfied i have the correct size ...to my suprise when i get home these are 2 different sizes on 1 set 1 fits the other doesn't and they hold us responsible to check but who hangs these buy 1 get 1 items on these hangers and i wouldn't have known these are likely to be 2 different sizes ...the staff or packers must just do their jobs accordingly cause now i waisted my hard earned money..i will definately not shop here anymore ...this was a horrible experience.