As I said, the company is Cloud Mining Website. Their website is
www.cloudmining.website. They do not have a place to type the amount. Then I would not have been trapped like this. They have 2 drop down. One from 1-9 another from 10 Ghs to 10 Ths. As far as I can remember, I selected 2 correctly, but instead of 10 Ghs, I selected 10 Ths before clicking on order button. Hence the current problem.
Ok. I think I understand your problem. You must have a credit card linked to your cloudmining account. As you tried to make payment, you accidentally selected another premium option which requires you to pay more. Hence the funds amount to 20btc which get sourced from your credit card. You have two way. Immediately call up the website and told them you want to cancel as it was not your intention to get the package. Or, get advice from your credit card company on how to proceed further with this. I'm sorry this happened to you.