That seems to be the reality of Onlyfans. It's completely run by actual scam artists. You were the unfortunate victim of a bait and switch scam. These "account managers" employ a different number of scams to try and extract the most amount of money from people as possible. I even saw one recently where they acted like onlyfans bugged out and made their ppv "cheaper" than it was supposed to be to try and suade people into thinking they're getting more for their money. It's like they have a "how to con people" manual sitting right next to them while they manage these accounts.
They're not really clever as they think though, all of them call you "babe" like a braindead bot. I had fun with one recently by asking them details about themselves that they should know, like asking them "what's your eye color?", only for them to give me a wrong or a vague answer, because they don't know the answers to these simple questions about the person they're pretending to be. Anyways, they don't even seem to respond to me anymore between different accounts, which leads me to believe that many of the same people manage several accounts.
The only way to win is to not even play with these scammers.