I'm sorry to hear that. The abandonment sanction will still apply if you disconnect (even if it's not your fault) because there is no way for it to know if a player is making themselves disconnect on purpose to avoid an abandonment sanction if it didn't apply.
We are unable to provide anything back for getting an abandonment sanction or remove temporary suspensions but if you continue having an issue, please go through the Uplay and game connectivity troubleshooting I've linked below:
Game connectivity here
Uplay connectivity here