Incorrect phone delivery & incorrect billing!!

I ordered a Samsung S5 as my upgrade on the 4/02/2015. The phone was delivered on the 5/2/2015. However, when i opened the box i found that an incorrect phone was packed, a Samsung A5. I called Vodacom and asked them to collect the incorrect phone on the 6/2/2015 and i called again on the 9th, then again on Monday the 16th after i saw my online bill and that they are already billing me for this phone which i haven't received. I also queried the amount on the bill, only to discover that i have been billed for 3 handsets. It appears that i have always been billed for 2 handsets, from the beginning of the contract!!! I then had to lodge a separate query for that and was promised that i would receive a response within 3 days. I am still waiting for the handset to be collected, I have highlighted the risk to the many consultants that i have spoken to. What happens if this handset is lost or ****** whilst in my possession? I need for my bill to be reconciled and fixed and this phone to be collected from me!!! I spend at least 30 minutes each time I call Vodacom and yet i get not joy!!!! The ref no for the account query is S3-8XO3-XK2WQ and the other one is ***. I need this sorted out