Non-paid Time Off deducted from final pay and accrued vacation calculation

I am an exempt employee (full time). My company (I just submitted my 2 weeks notice) doesn't want to accrue vacation hours for my last 2 weeks because it's not "a complete month." Is that allowed?

They've also been deducting my pay for working less than 8 hours/day. Since my my accrued vacation was negative, HR told me not to use vacation code and instead to use "non-paid Time off" code in our time & billing system. So I accumulated some hours of non-paid Time off and they will deduct about 12 hours from my final pay check. However my accrued vacation is now slightly positive (like 4 hours, since I wasn't allowed to use any for months) and they will not pay for that unused hours since it's so "miniscule", plus not giving me any accrual for the last 2 weeks. Is this legal? It just doesn't seem fair to me....