Hey there, having a reliable connection is required to play Overwatch and all disconnections will be penalized. The game server has no way to discern a legitimate disconnection or game crash from one that is forcefully caused by a dishonest player to bypass leaver penalties. Competitive play suspensions, season bans, and permanent bans cannot be appealed. You can learn about this policy here:
In the end, it is unfortunate that not every gamer in the world has access to the internet connections required to play online team games like Overwatch, but rules like this are in place to ensure a fair competitive environment for those who do.