package dispute

i took up my upgrade over the phone and to my knowledge i took up a top-up contract. my billing has been quite high and i was told it was because of my high data usage which i disputed as I'm on wi-fi 5days a week. i top-up my phone with over 1Gig of data every month and also top-up my airtime. i was recently told that my package is an open line contract which doesn't make sense to me as i don't recall this being told to me when i took the upgrade. I've asked Autopage to send me the recording so that i can confirm if what they are saying is true but the haven't.