Vodacom being sneaky

Was phoned this morning, telling me I am eligible for an upgrade. I in turn told the lady that I only upgrade in april and would like to wait out the contract otherwise i will be asked to pay the remaining subscription on top of the current one. She confirmed that this would not be the case and the contract already ran out. Excited I went through the motions to get my new phone. Guess what the sms said after confirmation? both subscriptions need to be paid, client service send me back and forth.