Optics Planet Told items in stock refuse to return Chicago Il

I recently ordered a pair of sunglasses from Optics Planet and was told the specific item was indeed in stock. Three weeks later I was informed the item was not in stock. I then asked to cancel my order as there were no other items I was interested in purchasing. For the last four weeks they have been texting me at all hours of the day and night telling me I must choose another item and they refused to refund my money. They have also sent countless rude and offensive emails ordering me to choose another item. I have told these idiots no less than 15 times that all I wanted to do was to cancel my order. I have a hard time undeerstanding how these people are in business at all. This is by far the worst experience I have ever had dealing with an online purchase.