We are simply following our internal security policy in asking for proof that you are who you claim to be, nothing more than that. We aren't trying to strong-arm you into renewing. 🙂
Asking us to cancel an account. when the request comes from an email which is not associated to the purchase at all, is something we cannot do without proof. This protects both the integrity of your account, and us, from malicious actors.
Since you said the email used to register can't be used, we asked for an alternative way to prove your identity, in the form of a government-issued identification. (You did previously reply, "If you allow any other verification, please do let me know." We did offer the alternative method, which you indicated you were not comfortable doing.)
This has been policy for a very long time when an email address expires or is deleted, and we receive a request to cancel an account, license, or package. I'm sorry you feel this is not an acceptable way to do this.
That said, if you've removed your credit card from the Client Area, any renewal would go unpaid and eventually expire on its own.