CLICKS..PATHETIC SERVICE

It is rather disappointing when items bought online cannot be returned. I regularly purchase online from CLICKS. Recently two items were not what I had ordered, I went into LA LUCIA CLICKS to return item with my delivery note, I was very rudely informed that I need to produce an invoice,. How am I supposed to produce an Invoice?? All i am given my online is a delivery note. This is unacceptable and I will definitely not be supporting this store going forward