Incorrect item sold

I bought an item online but upon pick up I was given the wrong product, I even notified the consultant but he did not help and yesterday I was at the store after seeing the item I want and no one assisted me I even went to information for assistance and they confirmed that there are 8 items left as per the system but I left the store without getting assisted. Now I'm forced to use the product I did not choose and no one seems to want to assist.