Hello QuirkyOrc and welcome to the forums. As a future reminder, please avoid bumping topics that are several months old. This ensures that any older problems that have been resolved are not mixed up with any current ones players like yourself may be experiencing.
The in-game Competitive Suspension are not allowed to be appealed because regardless if you leave intentionally or not, you left the game and it harmed the remaining 5 team members on your team from winning the match. Also, by penalizing those with technical issues, they are more likely to take the time to correct those issues before attempting to return to Competitive Play. If you already have the 8-hour penalty threshold, that means you have left multiple matches in the same season and you are not taking time to correct your issues. Please avoid playing Competitive Play until you are very confident the issues have been resolved. If you continue to leave or disconnect from games you may be issued a season ban from that Competitive Season. This will result in the loss of all end-of-season rewards and be banned from Competitive Play for the remainder of the season. Three season bans result in a permanent ban from Competitive Play.
If you need to specific help with your connection issues, please follow these tips or start a new topic (as this one will likely be locked).