Vodacom cancellation policy is absurd and irregular

I called to cancel my Vodacom data plan as I have now subscribed to Vodacom fibre, I was then told I will be liable to pay a cancellation fee which I agreed on. I received a quotation for a premature cancellation of my modern data bundle plan on the 22 July 2025 which was an amount of R392.83 , I unfortunately missed the deadline and requested for another quotation on the 4th August 2025 and I was Quoted R1 604.78.

How does an amount increased to ridiculously high just over two weeks?

Please elaborate , I have made an enquiry regarding the two diverse quotations which has still not been resolved.