Can’t cancel subscription since my email is deleted.

Hello,
I have a Dropbox account which created by the mail of past company which I’ve left almost 1 years ago.
But the account still has my credit card info and Dropbox has been charging my card.

I cannot log-in as the business email address which is no longer in existence and cannot be recovered, also not able to login in any other way, which means that I can’t cancel the subscription by myself.

Plus, it’s worth to be mentioned that I’ve already sent a message through Dropbox Support to notice the situation and ask for cancelling the plan on 2023/09/17, which the message is written in Mandarin.

But I haven’t received any response till now, which means that:
1. Due to the problem of not able to login to Dropbox, my subscription is unwanted but still ongoing.
2. The request of cancelling the subscription I sent through Dropbox Support on 2023/09/17 is still pending, and the problem has not be solved.

With situations above, I would like to ask Is there anyway to:

1. Cancel the subscription of the account.
2. Receive the refund of lastest payment (because I’ve sent the request on 2023/09/17 to notice the situation, but haven’t received any response.)

Any help would be appreciated.
Thanks!