Insurance premium mess up

Vodacom is always testing me and like a fool I stick around, anyway I upgraded in March to a Samsung S20 and there was a lot of a hustle in that, but they got resolved. On the 30/06/2020 at 12:27pm I received an SMS that reads as follows " Dear Customer. As of 1 August 2020, your monthly device insurance premium will be adjusted to align with the impact of the exchange rate movement on the cost of repairs and replacements. Your new device insurance premium is now R128.80 pm. T&Cs remain the same. For more info contact ***."

I have just spoken to the insurance who said that the text was sent out by Vodacom and not them which was confusing but Okay.But my argument is that they had the whole of July to retract or send a fellow up sms to say that the text was sent in erorr. Times are rough at the moment and to be honest I was looking forward to the low premium but hey its Vodacom