If we are talking about that story, that is 12 years ago, not 6 and relates to a different fee structure, not raising of prices. So while I agree that this is a terrible development, I'm not sure that's what we're discussing here. More specifically after 2011 there was a huge downwards pressure on the market coming from increasing competition from virtual operators with decreasing prices.

Well the person I replied to makes a very specific claim. That prices were raised 6 years ago by all operators at the same time and that the regulator did not fault them. Neither can I find evidence of that price hike, nor can I find a statement by the regulator.