I tried to sign up but the account wouldn't activate because of the payment failure, so I gave up on the app. Two weeks later I was surprised to see that Drops collected the payment from my account TWICE, while I still couldn't really use the app. So I logged in and requested my about to be deleted and wrote a refund request. Two weeks later I was billed again TWICE! So Drops billed me for 70 EUR in just one month. This time the support was quick to react and did the refund within just 1 hour.