"You agreed to the terms"
high likelihoodThe business relies on the consumer having accepted the contract.
What answers it
The unfair contract terms regime applies precisely to standard-form contracts that consumers accept without negotiation. s.27 presumes a contract is standard form unless the business proves otherwise, and acceptance is not an answer — the whole point of s.23 is that an unfair term is void notwithstanding agreement.
Australian Consumer Law, ss.23-28 (unfair contract terms) — s.24 — a term is unfair if it would cause a significant imbalance in the parties' rights, is not reasonably necessary to protect legitimate interests, and would cause detriment if relied on; s.25 includes terms permitting one party but not the other to renew or vary the contract