Another option not mentioned in the thread is to accept it, and pay any of the fines associated with not meeting it. This happens all the time in public tenders and contracts, where the fines are calculated into the business risk. It does mean that the organization needs to set the right fines to make that unfeasible.
I've definitely seen hosting services do this. Sure, there's a 100% SLA, but if you actually read it, it says you get back the pro-rated monthly fee for the time it was down. So, in other words, you don't have to pay for it when it isn't working. Not much of an SLA.
Public transport does this too: in order to provide a robust, perfect implementation of a schedule, you need extra busses/trains/street cars (expensive capital goods) and extra manhours (generally most expensive part of the operation). Rather than invest too much money in making sure the schedule can be met, it's cheaper to pay fines when there are delays.
I've actually had quite good experiences claiming ticket credits or total refunds for some long-distance UK train journeys. I can't find the exact terms, and they potentially vary per-operator, but it's around 50% refund for up to 30 minutes delay, and a full ticket cost refund if it's >60 minutes. A couple of times, I've had a trip delayed by 50-59 minutes. I suspect this isn't a coincidence.
