retail system failures!!!

My daughter received 2 items about a month ago as a birthday gift. They are too small so last week Friday I went to a store in Alberton City to try and exchange them for bigger. At the counter the lady said they could not pickup the items from the system and could not help me. I find this disgusting as I was turned away unable to do anything with 2 clothing items I will never use. If someone paid Woolworths for them and now refuses to exchange or refund them then is not right. How do we solve this problem??? Why after a few weeks would your systems delete items off its database and for this ******* selfish behavior now refuse to deal with items that are off your systems? Why would your systems be setup that way, people are supposed to take back your stock and be able to do further business wit it. I need head of customer services details ALSO PLS!!!