How can the government regulate companies into providing good customer service when they can't even provide good customer service to their citizens?
How are the two at all related
What you do is have a real capitalist system with decent antitrust protections and real market competition instead a crony capitalist system where oligopolies can easily push regulators and legislators around.
And then, once you have enabled consumers to vote with their money, they will.
This kind of oligopolism, rent-seeking behavior, and general corruption are some of the problems capitalism was invented to fix. And the further societies stray away from actively defending a strong market economy, the more those problems start to come back.