Vodacom Billed for no phone received

I have an existing vodacom number. I decided to order a phone online for my son. I ordered the phone and mistakenly clicked on the wrong phone. I immediately canceled when the confirmation request came via sms. I then called the contact centre to confirm. I then selected the correct phone which suddenly wanted me to send documents. I did so. However the phone I canceled continued and suddenly I had a delivery. I asked to check the package before I can accept and the courier said I'm not allowed to open. So I refused the package. I have tried so many times to speak to someone and I'm either cut off or no one knows what's going on. I'm now being billed for a phone of which I don't have nor know for what package.