Credits gone missing

Hi all, I have been wheelin n dealin in the auction house as well as winning races and I managed to get my credits well above 999,999,999, but then I bought a car for a measly 1 or 2000 credits and noticed my credits going down when I know that I had way above 999,999,999. Why is this? Can anyone shed some light please?

999,999,999 is the limit, so you stopped getting credits when you hit the limit and never had more than 999,999,999. But don’t worry, even with only 999,997,999 you can still afford to buy like five of everything or whatever.

I see, so all my hard work is for nothing.
Thanks for reply

What is even the point of getting that many credits anyway?