It sounds very much like both the wallet file and the seed phrase you have are in no way connected to the addresses you have been withdrawing bitcoin to.
In addition to the advice above regarding searching for other wallet files on your computer, do you have any other seed phrases or back ups you could try? And are you certain you never used a passphrase? You might have added one while mistakenly believing you were simply adding a password to your wallet file.
Where did you even copy the addresses to withdraw to in the first place, because it doesn't seem like they came from this wallet.
Since I opened the wallet I did nothing to change anything. I simply made purchases and had them sent to the wallet address. The blockchain and Coinmama both verified the purchases. I didn't do anything with the seedphrase and know nothing about passphrases and have always had the same password to open the wallet. I opened the wallet a few days ago with the thought of selling my bitcoin. The balance was "0". That's when all this started. I really do appreciate all your efforts, and all the others on here, to help me with recovering this wallet but I'm afraid I don't have the savvy to follow the instructions. I'm sure if I were sitting right beside you with this computer we could get it done. At this point I think I'll see if I can find a reputable computer shop to see if they can recover this wallet. If I can't do that I think I'm just going to have to live with knowing I have a wallet out there I can't get to and take the loss. Thanks a million o_e-l_e_o and all for your patience and kindness.