Vodacom deducting 2 handsets!!!

I upgraded my phone beginning of July. Last month I was told my account is in arrears and had to pay it before i can upgrade... (this is now in September). They deducted from my account so no reason for it to be in arrears. This month (beginning of October) they dedicated 2 handset. When asking why they said that because I upgraded I still need to pay the old phone and the new phone. In all my time I have a phone this has never happen. My wife upgraded last year also with Vodacom and this was not a issue. This answer is unacceptable and ridiculous. I have never heard of something like this and no-one has warned me about this.