Cancellation

I started a free trial in late December of last year, but unfortunately I forgot about it and didn’t realize the trial had ended. Since then, it appears that the subscription has been attempting to charge me each month, but my payment method hasn’t gone through. I’ve received an invoice for each month, but it says that I haven’t actually paid anything.

I’m trying to cancel the subscription now, but when I try to cancel it, I’m being told that I need to update my payment method first. I’m worried that if I add or update my payment method, I’ll immediately be charged for all of the previous months that weren’t successfully paid.

I don’t want to continue the subscription, and I also don’t want to accidentally authorize charges for all of those previous months. Is there another way for me to cancel the subscription without updating my payment method or being charged for the unpaid invoices?