Bad service causes bad sales

Two jeans was purchased as gifts for my toddler which I wanted to changed but was turned down. The plastic tag and a part of the price tag was still intact and the jeans were not used due to the size being incorrect. Upon exchanging I was advised to ask the person who bought the gift for the receipt. Which there was around 60 guests and I'm supposed to contact each one to ask who the gift was from. Also was told that when people buy gifts they must not take out the full price tag which I think is the stores responsibility not mine. However this is a lollipop brand which is Pep brand. I am a regular buyer from this retail store and know that their items change on a regular basis so since there was no stock I was advised to keep it and allow my daughter to grow into it yet the reason I wanted to change it was because of it being too small. She made no attempt to checking on the system yet it was bought from Pep and had a don't care attitude. What happened to excellent customer service we supposed to receive? Why had have an exchange policy when I never had a problem changing gifts before without a receipt? Now I'm stuck with two items that my toddler needs to shrink into..insanity!!!