Pathetic Vodacom Customer services

Vodacom has sent me multiple notifications informing me that I am due for an upgrade. I went in to store and took my new handset. Thereafter I receive a notification advising that I will now be paying for 2 handsets. (The 1 I currently have and the 1 I upgraded) No one at store informed me that I will be paying for 2 handsets if I take my upgrade now. No one is willing to assist me now at the Vodacom stores or at customer care services. I cannot lay for 2 handsets when I am only using 1. This is unacceptable.