That's ... uh ... not what a rug pull is. They're telling you plainly from the jump that they're going to eventually charge for it. Point taken on your wish to wait, that makes perfect sense.
(not arguing)
recently saw an old alfred hitchcock presents where the character does the cheesiest most absurd rug pull ... and the person was boom dead. i assumed that was the origin of the term
OP edited to the idiomatic 'rug pulled from under my feet' to specify that he doesn't mean the above.