I click recovery credit rebate on accident so I amend it but I got charged 1400 and I only received 800 for my refund. Original return was 2k, how do I get my money back?

When you filed the amended return you told them that you had received your full refund and that they should take back the extra $1400 that they gave you.  You shouldn't have amended until after you received your refund.

You'll have to call them.  Have your original 2021 return and the amendment in front of you when you call.  Just be aware that they are heavily understaffed and backlogged.  They’re not easy to get a hold of.  Call first thing in the morning and prepare to be on hold for a long time.  This is the link to use to get ahold of them.

@nguyenvy201- 

There is no reason to call the IRS.

If IRS adjusted your 1040, but you submitted a 1040-X about it also,

IRS will now have to adjust your 1040-X also.

IRS has a big backlog of amended tax returns to get through.