Can I file a suit against Kohl's for not returning money that does not belong to them?

This is an unusual situation. My mom asked me to make a payment in person for her at Conn's, I misunderstood her and thought she said Kohl's. I handed a cashier at Kohl's a folded up payment voucher (which I had not even looked at) and $52 cash. The Kohl's employee scanned the voucher and took the payment. She stapled the receipt to the voucher and I went on my way. A month later, Conn's is calling my mom about a missed payment. It was then I realized I made a mistake. I visited Kohl's and when they rescanned the barcode on the payment voucher, it turns out a Kohl's credit card member has the exact same account number my mom has at Conn's. They said corporate would mail a check to my mom, but she has yet to receive a check. This was the first week of February. We've made several calls and