Unexpected attitude from staff

I recieved a gift for my nephew for Christmas. All the clothing is to small. I take my only 30 Min break to go and return it to maybe receive a gift voucher until I have enough time to actually go in and take something else for him. I go to the customer care services and they check on the system and all I was told is these items are no longer on the system. 6 different pairs of clothing items are no longer on the system. I ask the teller ok so what must I do with the item's as they do not fit my nephew to which she calls her superior and she tells me the same thing. Again I ask them what do I do with these items and again I was told it's off the system and there is nothing they can do. All the tags are still on the items. I think this is appalling especially from Woolies. No help was offered and night I add I got terrible attitude from both assistance. Again what do I do now with these items.