I change one star to four. After the next complain...

I change one star to four. After the next complaint they returned my money.
(They are thieves !!! Four years ago I hired a course with them and finished paying. After that in the other years during the summer they charge me $ 900 fees. First I will go to the bank to make the complaint and then the I'm going to sue !! They use your card number to get you money !! Some months no and others yes so you don't realize it)
In the end they contacted me immediately and transferred me the money they had charged me others! It was just a mistake.