Breach of agreement

Hi there. I am writing cause I am very upset. During black Friday my wife did an upgrade for a very good deal with vodacom. It included 2 devices for R630 along with a free powerbank and bluetooth devices. Only one device showed up and no powerbank. After making a follow up it now seems they will not give us the deal we agreed too and which we have in writing. Instead of R630 we will now have to pay over R900 with no power bank and only 1 device (because black Friday is over). This is a clear breach of contract, and even though the matter is escalated I am very upset. Should this not be resolved correctly (with a proper apology), I will review all options available to me. I will not pay this new contract that we did not agree to.