Stupid exchange policy at Me Price Clothing

Was gifted baby clothes which I wanted to exchange for bigger sizes. Exchanged a blanket that way an hour earlier at Mr Price Home without any problems.

After waiting in a ridiculous long queue at Mr Price Clothing I was told no exchange without slips, even though policy displayed in store only refunds need slip. All clothing items still had original tags and were from current season.

Why different policies for different stores?? And why does the Home and the clothing store feel like different businesses??