If new employees are leaving your organisation within the first 10 days, you have a serious problem on your hands.
You need to find out what that problem is, and fix it, double quick.
The first thing that needs fixing is your recruitment process.
The second thing to look at is your organisation, and why people don't want to work there, eg, pay, management, other staff members, lack of training, lack of future opportunities, etc etc.
Thirdly, when people are interviewed, you need to ensure they are not being told lies about what it is going to be like to work for your organisation. Many of us have gone to job interviews and been told how wonderful it is going to be, but the reality is sadly different.
Good luck with that, you will need it.