OP here. If you do NOT get a notification that some money were removed from your account you will NEVER know of the fact (unless you are logging in everyday to check the balance and the account movements) My bone is NOT with the valid/legal refund, but for the fact that Paypal did NOT bother notifying me. If that refund was somehow invalid/illegal/callitwhatyouwill, I will have never found out for months. TOO late to do something about it by then
You just decide to care about the notification. The money that was added on your account and subsequently removed was just bits on hard disc. Those bits didn't affect your life until you decided to demand Paypal to notify about it.