Bad experience with take a lot

I ordered and pay Take a lot for a kids GPS online tracking watch on 6 September 2017 for her birthday on 15 September. They say that it will take between 3 - 6 working days. Sometime it came through that it will only be delivered on the 21 September. I asked that they phone me to ask them to try and make the exception and to get hold of it ASAP as my daughter have her birthday on the 15th. Take a lot was just of NO ASSISTANCE to me. They just told me they can do nothing to make delivery earlier. I explained several times that I need it at the evening of the 15th. They just say it is impossible. Now my question is: "how can you advertise a product on the website but you don't have stock " to start with and how on earth can I pay for a product and have to wait 2 weeks for delivery. In my opinion they steel my money for 2 week. I cancelled my order immediately to make use of another supplier, who by the way deliver the watch within 12 hours. Now I struggle to get my money back because they will only be able to give me a voucher back - which I don't want because I don't want to do business with them EVER AGAIN. They advertise goods which they cannot produce. Unacceptable.