Your calculations are incorrect.
Between 1st March and 10th March, you listed 300 items so you have used all your free listings this months.
If you go to your account, items for sale and then sort by 'newly listed', you can check.
You have 5 complete pages with 60 items on each page.
That is your 300 items for this month.
You will be able to list 300 more in April.
As advised, on your selling page, you can access your free listings and see how many you have used and how many you have left.
Most sellers would like to have been able to list nearly 5000 items at no cost.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
