Contract Upgrade Mishap

I upgraded my phone online a few days ago, urgently needing a phone. The phone that I chose was in stock and delivery was suppose to be within 2-5 working days, which I excepted. I received my upgrade confirmation and was very excited for the delivery. For 2 days I've received about a 100 OTP number from Vodacom, even if I am fast asleep not requesting anything from Vodacom. When I phoned Vodacom to find out what the problem is with the OTP numbers, I was informed that the phone is discontinued and no longer in stock, while on the website it still shows that they have stock available and can be delivered in 2 - 5 working days. There was absolute no communication of any sort from Vodacom to inform me that they made a mistake and to inform me that the phone isn't available. Over many years I haven't had any major problems with them, but while I was tipping this message I received another 3 OTP numbers and still don't know why this is happening.