When registering, the email address was filled in incorrectly, and there was no email verification. Can I appeal to change my email again.

You should be able to change it by going into settings i.e.

Hover over username > Privacy and Settings > Login and Security > Click change next to your email > Enter password > Enter new email.

If that doesn't work, then contact support I guess.

I need to send a verification code to change my email address, but my current email address is wrong and I can't receive the verification code. So I want to contact customer service, but I don't know where to contact.

thaks. I'm trying.

On roughly the same topic what happens to someones account when their email stops working for whatever reason.

People might be using subscription emails which lapse or there might be terms and conditions which state if you don't login often enough it gets deleted or someone else might be able to jump in and grab that email before you can get it back.

How are accounts protected under those circumstances?

I never encountered anything like that. You got a real existing example for a service with such conditions? The only time I ever experienced an eMail provider closing, they sent out (at least(!) a month in advance) a notice, warning all users that from day X on, they would not be able to access their eMail addresses anymore, and that they should quickly look for another eMail service and change all their eMail contacts to that new one.

And I have never heard of any eMail provider shutting down his service without a warning to its existing users.

Yahoo or the other big free ones did that and it's obvious if someones paying a subscription for email it stops when it isn't being paid.

*nods* And there's always the gem of being locked out of your email account for whatever reason (by the provider or by hacking). Same net result: you lose access to your email account, which is tied to your GOG account. Nasty business.

From the internet: "On July 15th, Yahoo will be closing down inactive accounts (accounts that have not been logged into in the last 12 months) and releasing them to the public to claim. (date: July 10, 2013)"
plus:
"Yahoo! Mail China officially announced its shutdown on April 18, 2013. Users were warned that all emails, contacts, and account settings would be inaccessible, unless users migrated to the American version of Yahoo! Mail."

So, it looks to me as if these closedowns have been announced before they took place - which fits exactly my own experience of the past:
my first (free!) eMail provider sent out a warning (like Yahoo obviously did) to all its users, that it was about to shut down in a month or so, and that everyone should switch to a different provider, asap.

And - I don't know about you, but I check my eMails regularily...if you don't log into your eMail account for 12 months(!), then any negative consequences out of this neglectance, is 100% on you.

I mean - you don't let your snail mail laying in your apartment building's entrance hall, and then - when you finally find the time to check it out after 12 months(!) - complain that it is gone, do you? Well, yeah, sure...if you pay a subscription fee for a service, then of course the subscription will end if you stop paying...that's how subscription services usually operate.
But you can hardly complain about that, if you could easily prevent this from hapening, by simply continuing to pay your fees.
Sorry, but what was your point again?

It is that someone can lose access to an email easily. The same thing can happen to mobile phone accounts as well and how this is handled with regards to logging into services like gog.