I have been a MuseScore PRO subscriber since year 2020 for $29.99/year, auto payment set up via PayPal.
But yesterday, when using MuseScore on my iPad, it popped up message let me pay $39.99 for a PRO+ subscription; I thought that was for my original subscription to renew, so I clicked to pay.
Only one hour later, I noticed that I paid two times to MuseScore in the same day: $29.99 via PayPal and $39.99 via iTune; I cancelled the $39.99 subscription on my iPhone, but this only cancels the future payment, not the one I already paid. I contacted MuseScore support, but they refuse to refund me.
It's unfair to double charge a loyal user; I will stop any future renew and keep giving negative feedback wherever I can.