It not fair for the pepole with unstable wifi i play upstairs which makes it even worse
On the one hand I agree with you, but on the other hand if they removed this people would just disconnect their internet every time they wanted to DC to dodge the penalty. Do you have any old routers lying around? You could look into setting one up as an access point to make the signal better upstairs.
And it's not fair for you to disconnect when others are counting on you
If you can't have a reliable wifi you shouldn't be playing online games
Get an ethernet cable. The loss with long cable isn't nearly as bad as playing with unstable wifi.
I think the ban timer shouldn't increase, just leave it at 5 minutes, should solve problems for alot of people while still keeping the ban.