Extremely poor service

I purchased 2 remote cars for my kid and nephew. My kids car was working but not my nephews car. I wanted to do an exchange because my nephew really loved the gift. <br> After a lot phone calls, emails and trouble I finally got a response from Groupon. They said they could do an exchange but it will only be done in late January. I told them that's fine, at least I would be getting the item. I received an email few days ago from Groupon to say they have no stock, although when they initially responded they had a lot of stock. I phoned them again today and after about 20min I got through to a consultant who also said there's nothing they can so to help. I said I would hold to speak to a supervisor but they cut my call.<br> <br> This is absolutely terrible service from them, as they were going to do the exchange and after some time they said there's no stock. Now they want to only do a refund. How do I tell a child this after they sold me a defective product and initially told me they would to an exchange.<br> <br> I logged on to Groupon now and saw they indeed do have stock. Why is Groupon deceiving the customers and providing so poor after service, this is besides the long queues on calls???