Netflix scam or just iffy

So I'm not sure what type of scam this is or if anyone else has seen it. I get an email from Netflix saying a new device is using my account, I think it's one of the kids or something. Day goes by I check emails, billing information was updated next to a card I don't know, then my plan was changed to basic with ads, then the billing date was changed. This ended up giving a credit to the card holder on billing details, but then my PayPal was still the main pay account with the unknown being the backup funding source. I changed my password and logged out of everything. In hindsight I should of upped the plan using the backup funding source, but I just deleted it. It was 26 cents, I know that's not a lot but if you did that to a few hundred accounts? Any ideas or thoughts Thanks