Hold in mind that connection issues on the client side cannot be detected if it was on purpose or not.
So the system will punish unless it’s on the side of the server.
Make sure you’ve got stable connection before entering competitive again.
If you keep on having connection issues please go to #technical-support for troubleshooting.
Blizzard will not refund any SR
You can read more about this right here: Overwatch Technical Issues, SR Loss, and Leaver Penalties