Unless you have been a victim of writing the wrong word of a Seed down or the incorrect order of it, you do not know how frustrating and desperate such a mistake can make you feel.
When creating a new Seed, always double check its validity. Not only by writing it down and double checking it with your own eyes. To me, even if the Wallet checks two or three words, it means nothing. There could always be an error and I try to minimize it.
Check your Seed twice. Do not be lazy.
I have also been a victim of this before and I almost cried because everything I was inputting to get my account back was never working for me. I tried different means, I used different words maybe it's going to help me to get it correct but I could not. I had to leave and go to bed in excruciating pains because I had tried everything I needed to do. I had to go back to try inputting the seed phrase after some weeks my mind had settled down. I finally got it correct after hundreds of trying.