If I signed a contract to pay a certain amount of money each month then that should be the amount of money I pay each month. Should not be legal for them to change the agreement halfway through and then putting "we can change the agreement halfway through" in the terms of service does not make it acceptable.
Honestly, labour are doing the right thing. And when competition ain't competing. The only thing they can.
You may have noticed UK mobile companies joining over the years. T-Mobile and orange became EE. O2 and Vodafone trying to merge.
I spoke to an Orange rep before the merge. He was commenting on how the company considered there to be too much competition in the UK mobile market. At the time, there were 5 providers. Legally, 3 or more is required for it not to be seen as a monopoly.
The attitude gave me a clear idea odf how these companies see competition.