Mweb bullies

Took out a fibre contract a few months ago. Mweb assured us that there would be no penalty if we moved...now they changed their tune completely. And to top it all they decide to change the contract without giving us any option an increasing it by 20%??? Bullies. What is the point of s contract if they can change the terms at any point. Like ordering a Russian bride...and the they send you a different one. Big business bullying consumers.