"Unable to upgrade my iCloud storage from 50 GB to 200 GB with error: I've tried several times to upgrade iCloud storage from 50GB to 200GB which always fails with a notice 'unable to complete .... try again later' or similar. My payment for any Apple services, is through PayPal which doesn't have any issues. Could you please advise how I can get in touch with a living 'compos mentis' human being to help resolve this issue?"
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Troubleshooting Upgrading iCloud Storage:
A. Turn Off All VPNs:
Id you have any VPN connections on, turn them off.
B. Use Another Device:
Have any other device? If so, try upgrading using that plan --you don't have to use an Apple device for this; just doing it online. Go here: iCloud+ Plans and Pricing - Apple Support
C. Keep and Eye of Apple's System Status:
There appears to be no system status, as of this reply, though there may have been early on. Go here: Apple - Support - System Status