Write to ivan.sevilla.ruano@gmail.com and we'll get back to you. For a bug, tell us the app version and your iPhone model.
Open Settings → Restore purchases inside the app. If it persists, check that you are signed in with the same Apple ID you bought with.
On your iPhone: Settings → your name → Subscriptions → Veintiuno → Cancel. You keep access until the end of the paid period.
Inside the app: Settings → Language. By default Veintiuno follows your iPhone's language.
The right play depends on the table rules: number of decks, whether the dealer hits soft 17, whether doubling after split is allowed, whether surrender exists, and whether there is a hole card. Check which table is selected in Settings → Rules.
No. Using electronic devices at a gaming table is forbidden and in many places illegal. Veintiuno is for studying at home.
If gambling has stopped being fun, ask for help. In Spain: 900 200 225, free and confidential.