Bit of a rant here, but I am currently subscribed to a game development related Patreon because I wanted to follow the development of a project that was interesting to me. The reason I covered the name is that the developer is doing a fantastic job with the project, posting regularly and providing interesting and informative posts, but the main advantage of Patreon is simply that he also provides builds which I was interested in checking out.
Patreon rebilled at the beginning of the month and I thought "Fine I guess, but I don't really want to pay $6 a month to get test builds of this game" and tried to cancel, assuming it would simply not rebill next month, but instead of cancelling rebilling, Patreon says I will immediately lose access to everything I can currently see on Patreon and new posts for this month, even though it billed me for this month literally three days ago.
There is no technical reason they can't just cancel rebilling and allow me to access this subscription until the end of the month, but they are clearly hoping I'll be scared to lose access to what I've paid for and will forget about cancelling later in the month, which would be the better time to do it, since I would benefit from access to more posts and development builds. There are a few other subscriptions I've used in the past that remove access to everything the instant you cancel, but even Amazon lets me continue free trials of Prime until the end of the trial period when I cancel it.
There are presumably no laws against this, or it was mentioned in some legal bullshit I ignored when signing up, but I do think that there should be a law that forces providers of subscription services to allow users to access their subscription for the entire period for which they have paid, regardless of whether they cancel their subscription if no refund is due.
My bank lets me do chargebacks in cases like this.
This is a bad idea. Chargebacks are only meant to be used in cases of fraud, which isn't the case for OP, who simply wanted to discontinue his subscription.
You also will usually get auto-banned from any platform you issue a chargeback against, because in issuing a chargeback, you're making the claim that your payment was unauthorized, so the assumption is that your account is compromised somehow. So your account will get banned as a preventative measure to prevent further unauthorized access.
It's meant to be a last resort option, not a first choice.
EDIT: Glad to see that LemmyWorlders never left their Redditor mindsets behind. Blows me away that, even on the Fediverse, people will downvote truths they don't want to hear.
I've charged plenty of things back and never been banned. Pizza that never came, products they never delivered, subscription services that never provided value, still haven't been banned. Maybe a US thing or at least YMMV. It's not just unauthorised transactions, it's also ones where you didn't reciever the service you paid for or the company you paid refuses a refund.