I mentioned in my recent frugality related article on Rotating Streaming Services, that I had quit Amazon Prime a while back because I was not satisfied with the increased membership price, commercials in Prime Video, the prices and quality of their services. In that article I also gave a link to a MMM forum post where many others discuss why they have quit prime as well.
Occasionally from time to time I get free month offers from Amazon. I just checked and they are offering it to me now. Are you not currently subscribed to Amazon Prime and also offered the same? You can find out as well here,