The dormancy fees seems to be a new thing with the ewallets.
skrill &
neteller introduced at start of the year. Unlike entropay they did notify us 2 months before it came into effect.
I used to have entropay account but they stopped service to my country around 2 years ago. My service from them was pretty good but they do stupid things from time to time. They notified me only a week before they were closing my account they said they sent an email 3 months prior but something went wrong and I got no notification. Maybe something similar happened in your case.