can child support that has never been modified in many years become retroactive and payment be made for those years

My child support had not been looked at for many yrs the first time that it had modified was when my daughter turned 18. It lowered from approx 700 a month to 455 a month for 2 children. I turned in paperwork that they asked for my income but never heard anything so I assumed it just stay the same. Then when my 2nd daughter turned 18 it was lowered again for half of that for 1 child. Then I had turned in the information for income again and this time they did look into it and it was raised around 800 for one child. I was then told that I should have been getting over 1300 for the last several years according to what the income had looked like. Is there a way to modify the child support for those yrs to see if there can be any retroactive payment? I was told by the person reviewing the case that they did not understand why nothing had been done over the yrs and when I talk to the people at the dept for non 4D they said that it must have been 1 of those many cases that slipped thru the