Every subchannel (like Me-TV and ChargeTV) is controlled by local broadcast networks. This means that their content changes based on local contracts. It's likely that your local station carrying Me-TV has replaced it with Charge TV. I would also guess that with this change, your local station is owned by the Sinclair Broadcast Group.
MeTV may no longer be available in your area, may be on a different subchannel (and different number channel on Comcast), or a subchannel on a different local station. This will vary from market to market.