Overdue Refund

I had went to buy a dress at the store that I liked and it out of stock in store and the lady that worked there suggested that I buy the dress online.She did all the ordering online for me and I payed in store for the dress,after a few weeks a message was sent to me that the dress was out of stock online and that they will reimburse me within 7 days. The 7 days went by and I had still not received my money. I kept on going to the store to ask what is actually happening and they would always tell me stories.2 weeks went by and I still did not receive my money.I only received my money about 3-4 weeks later which is basically a month later.Their service when it comes to refunds is really disgusting and disappointing.It’s as if it’s their money but it’s actually our money.