Telephonic deals not what it's promised to be

Got a call from Vodacom on the 19th of December, Told me I'm due for an upgrade and offered me a deal. I've asked the lady (Nontanto) if the call is recorded in case I'm not getting what's promised. I received the phone on the 29th and it's not what she said it will be. Got a sms this morning and the monthly amount to be paid is R119 more than she quoted. Called customer care and was advised the phone will be collected and a new deal has to be made. I've asked about the current deal and was told that it was wrong and a new recording will be made with a new deal. What is the use of making recordings if they can just say that it was wrong?