Contract Cancellation ****

I called them to request to cancel my LTE Contract (That has 12 months left) since I was able to get a WiFi that's cheaper and more stable/reliable. They sent me a quote saying my cancellation fee is equal to 12x monthly premiums I was paying. So essentially they are saying I can't cancel this contract because paying this cancellation fee means that I will I would have paid them for a service that they will no longer be providing. It doesn't look like they implemented the recommendation by the Consumer Commission and they are still carrying on with ****ming customers and making it difficult for us to cancel contracts with them