Hello Fiery...,. I am sorry to hear that you received an abandonment sanction for that length of time.
Unfortunately no Ubisoft agent has the ability to remove sanctions. We do not have any tool or ability to do this, as this is solely controlled by the game only.
please also note, an abandonment penalty for 7 days would not be given for a one time offence. You would be banned for 7 days only for multiple disconnects in a short time or if your account was reported for breaking our code of conduct.
What we can do is offer troubleshooting. The following guide should help improve your connection to our servers on PC -
https://ubi.li/YPwnl