Sending products as "autoship" which I did not authorize

I did a survey as a request by Amazon at which they offered a prize of ;my choosing, which was the CBD items one of which was free and the other I picked as option for $4.95. It arriived quickly and used only once.  A few weeks later the company shipping dept. sent me the identical products with an invoice of $187.34. I am not paying for it and will send it back to them as I did not request autoship. Request  a confirmation from them to my complaint!