SLA = Service Level Agreement
Diginet: It goes down, you phone, they *** themselves and they get it working. Generally the SLA has a provision where if the line is down for too long, you get paid for the outage.
ADSL: If goes down, you sit on hold for 30 minutes, and then they ask you to check your DNS Settings. If that doesn't fix it, your fault gets logged, and some guy will phone you around 10pm the next night to help you.