said by AnonMan :They bill you every month before they provide a service.
Most of you are wrong you know.
They are not legally allowed to bill you for services not provided.
Now grant it was due to an act of god or whatever, which yes happens but if they can't provide you service, for whatever the reasons are they are not allowed to bill you. Now the most they are liable for credit wise is for the period of the outage, not a penny more as most try to get more and that's up to the reps discretion.
The only general exception for billing without service is generally non-pay or customer caused issues. If the provider can't provide it and it's not the customers fault they can't charge.
As for SLA and agreement comments, those are generally in place to guarantee up time or a repair period. So while residential has no guarantees and they are not required to fix it in X amount of time or compensate you for above what you pay they must still pro-rate a credit if requested. Most SLA agreements for a business (or a good business at least) generally offer additional compensation for outages or not meeting SLA or allow contract breach.