If you are on a fixed contract then your stuffed or can you get out of the contract???
A very silly example but could happen, Vodafone puts a promotion out, $10 a month for home phone line and broadband, contract is for 12 months. They get 10,000 customers to sign up, the very next month they put the monthly cost up to $50 a month and make changes in the contract.
What rights does the customer have????