Bad service

My mom bought headboard and 2 pedestals at this furniture store. She paid in cash and was promised delivery the week before Easter weekend 2019. The day of delivery they called and complained about the rain an moved delivery date to the Tuesday following that public holiday. The Tuesday they didn't deliver and no explanation whatsoever. Mom went Wednesday to ask what the issue was. She was told that they do not have stock. Question is: why do they sell something they don't have? Secondly, shouldn't they let the customer know that they are out of stock and advice when they expect to receive stock? They **** all this time about delivering something that was not there... what exactly were they going to deliver Easter weekend?

Now my mother is fed up with all the lies and she want he money back. They give her the run around and say they don't have money to refund her. The whole LEWIS doesn't have money???? Really???? She is told to wait for people to pay in cash before they can refund her. They told her they will call her to collect the money when they have cash. The weekend passed, the 25th have passed and the month is almost finished but still no call. I'm appalled by this behavior. I don't understand what's so hard to refund the money because it was taken by false marketing. Please help