As far as I'm concerned there hasn't been any change in servers in ages. For some reason, people think it changes daily or weekly. Not so. If you're having an issue, personally I suggest the following.
1. Force stop and clear the cache on your application.
2. Restart your device.
3. Try a different application, and make sure your app is updated.
4. Shut down your gateway/router/modem, whatever it is you have for several minutes, and restart.
5. Good chance you'll be up and running again.
6. If you've been out of the country for a couple of months, (doubt it), maybe the server did change.
7. Log in and make sure your account is paid up and shows active.
8. If all else fails, open a ticket, describe your issue(s). Say please and thank you, and ask for your account to be reset if necessary.
9. If you really think you do not have the correct server, feel free to PM me and let me know what you are using and I'll get back to you.