Let's think about this...
You have a team of committed people doing their best to get the best deals for us, by choosing the best value from competing suppliers, for just the cost of their salaries. You replace ( or transfer) these to a company that will have no competition, has its own ( or adopted } staff with a whole layer of management who have no personal commitment to or interest in the service, looking after their own well paid jobs and making as much profit from the deal as they can for the shareholders.
And it's a surprise that this costs more, rather than less?????????