If they continue to lie and ignore the scope of this problem, then this is potentially a much bigger deal than some people losing five or ten bucks. It shows than instead of owning up to their mistakes, Microsoft is willing to lie and screw over their customer base at any point just to make a few more bucks in the short term. If an error entirely of their fault happens to make them money, they will choose to deceptively make things up instead of coming clean to their customers as any decent business would.
Let's just put it this way: If Microsoft chooses to act in such a blatantly untrustworthy manner that is beyond anything they have done so far this gen, then it will be much more difficult for me to choose to invest my trust and my money with them for a whole new console generation.