Has anyone received the wrong amount back for their tax rebate?

As many as 350,000 households are not getting the $300 per child refund owed as part of economic stimulus rebate payments. The IRS says taxpayers' error and problems with commercial tax preparation software were responsible for the problem affecting a tiny percentage of the 130 million taxpayers who are waiting for their tax rebate. He said the IRS will send letters to those who missed out on the refund and that checks for the child credit will be mailed in July.