Package changed

I've changed my Package from 'Compact Plus' where I was paying over R600 to 'Compact' where i'll be paying pay R479. I spoke to a lady on chat who amended my Package to Compact. Now I received a bill again that says I need to pay over R600. I'm not happy with Multichoice, the way they ***** their clients it's not funny. I want to make sure I write about them on socials everywhere. I won't pay that amount I need explanation.