Vodacom being sneaky again!! Is this even legal?

I received a phone call informing me that Vodacom no longer has my package available. They can offer me another package which has more data but it will cost me R50 extra a month (this option is apparently the cheapest one). This is a way for Vodacom to force their clients to pay more money when people are already financially strained already. I can afford it, but I don’t want to pay more, I’ll rather give that money to a family to put food on the table. Shame on you Vodacom.

I spoke to a lady named Tanya and she refused to give me a reference number for the call.