iPhone Encrypted Backup Password Failure.

Now this is where I draw the line with Apple. Recently, I backup my iphone 6s on my itunes from my PC. The backup took long but it was successful and encrypted. I got an iphone 8 and decided to restore the back up from the iphone 6s onto it. Several tries with the "encrypted password" I wrote down and it kept telling me wrong password. I left it for a few days then tried to restore the backup again with the same password it was successful.

I then backup the Iphone 8 with the same password I used for encrypting my backup which was successful. Decided to restore the backup from the iphone 8 to an iphone 7, it keeps telling me incorrect password. Been trying it over an over with the same password, the password to unlock my phone, wifi password, icloud password, my computer passwords etc. I was not able to restore the backup.

On top of all of it, I have over 746 contacts on my iphone, that "suppose" to be backing up on my icloud. I signed in on my new iphone its only showing 446 from my icloud contacts and none on my recent notes. I now have come to a conclusion if I don't get my backup restored with and all my recent data that suppose to be in my icloud, I am getting rid of all my apple products and moving to another brand. Simple!

P.S. I AM NOT CONSIDERING 6 Years of data from my Iphone lost.