Hassle with taking the package

Good day, I apologize. But there was an error and I would like to solve it. A month ago I was looking for a server for my programming studies. I turned to a friend of mine. He recommended Amazon and told me that you provide a server for a year for free. I read everything and took the package services. I started it once and realized that it was not what I needed, and immediately closed it. After 15 days, you withdrew 256 dollars from me. Not long ago, I sat down to figure out what was the matter and saw that they still wanted to withdraw 500 dollars from me. I am very sorry probably it was some kind of miss click or something else. I was not at all familiar with the servers and the functions it provides. How can you solve this problem without withdrawing funds.