@CompoYou cant I'm afraid, its in the terms and conditions.
You may get a Gesture of Goodwill from an agent, but I wouldn't count on it.
https://www.o2.co.uk/termsandconditions/mobile/our-latest-pay-monthly-mobile-agreement (Section 2.2)
As no network says 100% uptime, and faults can and do occur.
Unfortunately mast faults can be long drawn out affairs, due to access, parts etc.
- Xperia 1V - o2 and Spusu
- Pixel 8 Pro - o2 and Vodafone UK