Blocked from calling but trying to sort out Vodacom's mess

I have two phones on contract with Vodacom. I decided to upgrade the primary number online. Which I did on the 1st of July. I received the notification on the primary phone number via SMS which had the correct number in the message. The next morning when I wanted to check the deals on my secondary number it said that this number was already upgraded and the primary still can be upgraded. So begins the calls to Vodacom. I was assisted to cancel the one that was changed on Vodacom's side after I approved the correct one, by who knows who. I then had to phone multiple times as the wrong phone was still being sent to me a few call later I still had the wrong phone delivered but I sent it back. On Thursday the 4th of July I tried to phone again to see if the wrongly upgraded contract was cancelled and since then I have been receiving a message when I phone that I have been blocked from calling Vodacom since I have been calling the call center to many times and they want to prevent *****ulent activity. I want to know who changed my original upgrade from the correct number to the incorrect number, why have I been blocked from calling when trying to sort out Vodacom mess.