Items and service

My son received a shirt and shorts on Tuesday 14th May 2019 for his birthday. The clothing items are to small had labels and tags on. I took it to woolworths canal walk and to my dismay I was told these items were removed from the system so I cannot exchange it. Like how the hell these items were purchased recently to as confirmed with the buyer. Now what should I do? Throw these items of value away? Also your canal walk branch service is pathetic. They don't greet, tell you what's happening and when I escalated to the store manager it was I requested for world War 3 to happen. There is no customer service or building of rapport at all. Pathetic I tell you.