VIP is billed by Apple. On your iPhone, open Settings, tap your name, then Subscriptions, and choose Los Customs. You keep VIP until the end of the period you paid for.
In the App, open the account page (top left on the home screen) and tap Restore Purchases. Make sure you're signed in to the same Apple ID you bought with.
Purchases are made through the App Store, so Apple handles refunds. Request one at reportaproblem.apple.com. If a render failed, its coins come back to your balance automatically.
Sign in with Apple on your old phone first (account page). Then install Los Customs on the new phone and sign in with the same Apple ID.
In the App, open the account page and tap Delete Account. This permanently removes your photos, builds, coins and account. If you have VIP, cancel it first in Settings, because deleting your account doesn't stop Apple's billing. Can't open the App? Email us from the address you signed in with and we'll delete it for you.