I filed an amended return on April 29th(it has been accepted) but I am STILL waiting on the refund check to show up. Is there someone to contact about this?

[Critter-3]

Amended returns this year could take 6 months or longer to process ...  

https://www.irs.gov/filing/wheres-my-amended-return

[fanfare]

the regular advertised wait of four months has not gone by yet.

expect to wait much longer that that this year.