tax return irs changed my refund from 3.193 to 393,00 they say my agi exceeds 75000.00 my agi is 4.309 i dont no what you all did wrong but i dont make 75000.00 a year

Based in the misplaced decimal points  and commas in your question you may have made some similar errors on your tax return.  But we cannot see your tax return.   The message you are seeing is a generic message the IRS gives you when they have changed something on your return and reduced your refund.   They will send a more specific letter in several weeks.   One possible reason which is very common this year---did you say you did not receive the 3rd EIP payment of $1400 per person when it asked you?  If you really did receive that 3rd stimulus payment the IRS knows you got it, and if you put it on your tax return again by saying you did not get it, they reduce your refund by $1400 per person.