Y is my return email 55$ less than what I was told I was getting. come to find out they took my amount owed to state out. but I was told I had to pay by ck w/voucher

if you are so "trustworthy" why isn't there a phone number to call you and actually get through to someone? Here is my problem:

my federal refund said I was supposed to get 529.00 back, but owed state of Missouri 55.00. at the end of doing my taxes, it printed out voucher telling me I have to send in 55 in a check. why is that if my federal was reduced by that amount?? I got the email telling me my refund would only be 474.00.