Little to no taxes taken for federal from employer

employer for many years decided last year they were only going to take 59.00 for federal taxes. They said I had a 4,000 child tax credit, and didn't take hardly any for the year. Thing is, I never changed my W2's or anything to do with that from previous years. I usually got quite a bit back due to dependents. This year, I only found this out when waiting for w2's to arrive on my work website. they offered up no solutions, other than to talk to my tax advisor(who has those?!) to see what payment plans could be set up. I thought it was the employers duty to correctly take out monies for government.