Even though I had never tried a paid upgrade, I signed up as a member, and from the next day, $20 was paid on a paid plan, and 21,000 won (Korean currency) was paid. Found this when it's already been going on for 2 months, and I've never even registered a payment method on Chat GPT! I just logged in with my Google ID and the payment method was registered on Google ID, which seems to have forced payment.
In addition, if the payment has been made, even a paid service should be available, but only free services are currently available.
I'll apply for a refund through my credit card company, but.. Many people, not just me, are suffering from fatal payment errors. It's so uncomfortable. Improve it!