downgrade penalty was not explained.

Hi, Ive been a Vodacom customer for many years. I have recently inquired on changing my contract to something cheaper. I was told that I would have to pay a "penalty fee" of R1500 plus for changing my package. This is a ridiculous amount to charge a customer for changing a package, considering that the amount payable towards my handset remains the same. Why is the fee for downgrading so high and how is it justified? i was not explained there will be penalty about downgrading my contract but to upgrade there no charge its done with a smile . it just feels like a story of i'm the *** getting milked here for money. very disappointed and shocked by the greed your company shows, let alone the poor service. i just feel as a customer to down grade or up grade surely it's a clients right to do with any hassle. i would understand if you have to give a 30 day or 60 day notice to change . but now you have to pay penalty to do that it's not like i'm changing providers or any like that vodacom still getting my money and having me as a client i just wana downgrade my contract. im due for an upgrade and wana do a laptop deal and the amount the laptop i wana take will be way out my budget. vodacom still going to get the 1 grand from me a month. this is just crazy