Vodacom **********ly contract!

I took out a contract on the 1st November 22 for an iPhone 11 at R399 per month. After completing application, was sent a message that it's out of stock, I then received a debit mandate of R1330 which came a shock because the deal is R399 and added fees were NEVER discussed. I kept calling to get clarity but cudnt get through. Now they BLOCKED me from calling Customer service. I have sent a request to cancel this contract as it's out of my AFFORDABILITY, but no 1 is helping. I am frustrated, I never agreed to this