Retirement tax questions

I filed my 1040 and the IRS sent me a refund check for my taxes owed on the IRA distribution––I was informed by the irs phone rep that the 4b amount was automatically removed from the 1040 because of 4a being empty.  I have to file an amended return ––turbo tax still blanks out 4a  I will fill 4a in by hand and jump through the IRS hoops––this is going to be the nightmare of taxpayers for 2019. Many will spend the refund because the IRS states in the letter that an error was made on tax calculations––bet they will come back for it and penalties to boot. Be prepared to spend the better part of a day on the phone to the IRS getting bounced around––-ask immedietely to be transfered to the tax law specialist (they know what they are talking about)