Pathetic Customer Service

Clothing was purchased for my daughter in July and they were too small, I did not have the receipt for the clothing as they were a gift and the person that bought the clothing had left to work out and had the receipt with him, I called the store and advised them that I do not have the receipt and I would like to change the items, they advised me that I have to have the receipt and when I do I can come through and exchange the items, I received the receipt on the 24/11/2017 and went through to exchange the items, the manager was very rude and did not assist in any way, all she did was basically throw the complaints business card at me which does not have a telephone number and only a email add on it and told me to escalate my query through to the complaints department, I mailed the complaints department and advised them that this problem was out of my control and they clothing still has the swing tags on them as well as the receipts and I do not want to exchange it for cash but bigger sizes, they advised me that they cannot exchange the items because of the date, my question is now what do I do with a bag full of small clothing?? I do not recommend this store to anyone, they are all about their image but have no customer s****s what's so ever