After you file

I received thirteen 4464c letters from the integrity & verification operations. It started on the 3rd of February and every beeping day I go to check my mail and here comes another one. I called and called to see what going on. They tell me only one letter went out but no one is giving me a F-ing answer. It’s starting to piss me off when they keep on sending me these letters wasting government money but hold my refund.