Maybe my explanation here is not that clear. The reference letter I submitted to the IRCC dated Dec 2020 is signed by my employer himself. Last March 2021, i tried to ask another reference letter but he refused to give me one, he insist that I will just submit a copy of my contract and for him that is already a proof that I am employed with him. I explained to him I need the reference letter as it is the one they needed, but still insisting again and again that I will just show them my contract. Thats the reason why I used the Dec 2020 reference letter because I thought it would be ok since that letter is genuine and signed by him...Unfortunately, during d verification, he said he never signed the letter. When I received the Procedural Fairneds Letter, I approached him asking if someone from Canada Embassy called him, and he told me someone called him 2months ago. So I told him what I am facing now to the Immigration. He asked me to show the original letter, I showed to him. And I asked him to make a supporting letter that he need to admit it was his real signature because he's the only one who can prove it that it was his own signature and I never forged it. After 5 days, he told me he will give me a supporting letter admitting that he signed that letter dated Dec 2020. My only mistake is that when he refused to give me a new reference letter last March 2021, I didnt inform him I will used the Dec 2020 reference letter...