Every January I accrue 120 hours of pto time for the year when I pull up my time card it states accrued 120 hours as of March 10th I had used 72 hours for sickness ect it stated that as of March 9th I had 52 hours left I quit the company on March 9 th and

I was told I would accrue 120 hours every January of pto time on my time card if I click on the accrue tab it gives me the amount of hours I have accrued which started with 120 hours in January I have used about 7 2 hours since January due to sickness ect I stated I had 52 hours left after taking these days to use I quit the company march and received my last paycheck and they kept the whole check and subtracted the hours that I had worked for the week from pto days . How can they keep my last check ?