Private companies are fine until the point they make a monopoly.
In my country the gas prices are kinda same everywhere and whatever changes, they only go up.
Although I am 100% certain that the current way the governments are is wrong (all they care about is to get elected and steal our money), there must be some sort of government that can provide the tools to force private companies to play fair.
I agree. But it is usually governments that create a monopoly. Monopolies cannot exist in a free market.
When the Bell patent on the telephone expired thousands of phone companies popped up. The government ended up giving monopoly power to the Bell phone companies for local and AT&T for long distance for over 50 years (that 50 years where we had the same dial telephones). Imagine how advanced our phone technology would have been long ago had the government not given them that monopoly.