Misinformation

Good day I went to a rage store in the Boitumelo mall store in welkom and I bought a pair of shoes for my daughter and I bought it on my store account. When I got home the shoes were a bit too big and I had to go back in for a size exchange or return. Unfortunately, I had lost my receipt. When I got the the lady told me I could not be assisted because I had to have the receipt. What puzzled me was how can I not be assisted when I bought the shoes on account?!? I would've understood if I bought them cash. So I went to another rage store just to enquire with regards to this, and I was told that I could be assisted. Now that I got a different answer, I went back against to the store where I bought the shoes and I was told it was too late, what am I supposed to do now????? What am I going to do with these shoes???