Loyal customers are punished

I am being punished for being a loyal Vodacom customer! I saw a deal in the 4U September magazine, A Huawei P20 plus a T3 10" Tablet. As I am due to upgrade (a significant upgrade from a Top Up 200 to a Smart M+) I was thrilled at the prospect of getting both for R899 p/m. Only to be told that that was available only to NEW accounts. NOT Upgrades. But that the P20 only on an M+ package could be mine for just under R1000. So I'm being punished for wanting to stay with Vodacom. Oh, and the best of it is that, apparently, customers are supposed to know that the offer is only for new numbers because it includes the wording "free SIM and connection fee." Call me stupid but there is no connection there to upgrades... because you usually have to pay a token amount to upgrade anyway. I am intensely disappointed in Vodacom.