Consent to a contract cannot be revoked at any time, no. And it's obvious that something happened in those 6 months between "yay" and "wow, it's horrible", and

Consent to a contract cannot be revoked at any time, no. And it's obvious that something happened in those 6 months between "yay" and "wow, it's horrible", and that's where the campaign happens to be in. You may find it gross to speak of the truth, but that doesn't change it.