When you in debt, you get 7 days to clear the debt. I have never seen or heard anyone get their players sold after just two days. The 7 days starts the next day after you go in debt. Then they sell your players one by one. There is no notification for this except an email which will tell u so and so has been sold. When they sell it's not by bidding process if im not mistaken. They just remove your player and credit his value.

You have been warned and there is no reason to complain actually