Charged old & new handset installments after upgrade

<p>I upgraded my contract in August (online via www.vodacom.co.za) after checking my upgrade status and finding I was eligible.</p> <p> </p> <p>Now I've received my statement and see I've been charged two separate "handset installments" for both my old contract and my new.</p> <p> </p> <p>This was never brought up with me during any of the online processes, nor any of the telephonic. The previous time I upgraded this was not the case.</p> <p> </p> <p>I don't think this is acceptble. I would have waited until my original contract had ended if this issue been brought to my attention at the time.</p>