Rude stuff and very undermining

I bought few items yesterday at Ackermans clanwilliam ,8135.so when I got home the stuff that I bought couldn't fit I then decided to return it ..to my suprise they told me that policy doesn't allow to return the items that were marked down so was forcerd to rake something else of the similar Value/amount..I am very upset because nobody told me about what so called policy before I even purchase these item.how am I supposed to Ackerman policies if they are not at my disposal