Submit PIT-36 in Poland

Dear Pan Brzezinski,

My name is XXXXl, and I am a US citizen living in California since January XXX.  Prior to that I lived in Poland for many years and have a karta pobytu stalego. On XXXX I sent my completed PIT 37 to the Urzad Skarbowy w XXXXX.  Last week I received information that the Urzad had sent a registered letter to my former address in Poland.  I contacted the Urzad and they told me that I should have completed a PIT 36 and not a PIT 37.

During 2020 I had two sources of income, one from a Polish company in which I received a PIT 11.  The other was from a foreign registered company which did not have any activity in Poland other than me and a company bank account with a Polish bank.  I received income from them and sent a payment each month to Urzad Skarbowy.
Now I need assistance in completing the PIT 36 because I am not confident I can do it correctly by myself.  I can provide you scanned copy of my PIT 11 and the PIT 37 I submitted to the Urzad Skarbowy, as well as a list of all payments I have sent to the Urzad Skarbowy.
Can you assist me with the PIT 36?
Thank you for your help.
Best Regards,