I used the website www.ldafoundation.org for my studies. I downloaded and used their materials and books, and after that I decided to donate money. I pressed the button “donate” and indicated my card number. The website took double sum from me. I wasn’t sure if it was appropriate to ask for money back, but after that I noticed that they have charged me again. I don’t know what measures to take now, so please maybe someone can advise me something.