always a **** in the fine details

Always a **** in the fine print. I share my data contract with my kids and wife. I have the ruby plan 70gb so mtn phones me to upgrade to the ruby 150gb.I think cool more data because the kids use a lot. The **** its 70gb shareable and 80gb promotional that can't be shared. this was not the contact i was sold i might as well remain on my old contract. I want to cancel this contact and go back to the one I was on I have no need fir 80gb promotional data.I need all data to be shareable this is a downgrade not an upgrade that benefits my families needs