After you file

who did you contact about the whole issue? because on my end, nothing has changed, same address and same bank. even my bank stated I should received the stimulus check on 1.4.2021. I tried to contact IRS and they are so busy. I just want to know who I can contact so I know if I need to file my taxes with this or if I am expecting in mail, or it's going to be a delay on my bank. its stressful because I have bills to pay and was kinda relying the extra money.