They lie to you to sign up, very unprofessional

I'm so disappointed with affinity health. I eventually found a medical aid I could go on as I'm no longer on discovery. I asked the consultant who signed me up if I could pay for my insurance up front for the year. She advised me that once my first payment went off I just needed to phone them and they would arrange this. Well guess what , I was told they do not allow this and I can't pay up front. I'm very angry as I specifically asked this question before I signed up. I was **** to and want someone to tell me why you lie to get people to sign up. Not professional and unetticate.