Safety warning

So we just moved into a property and 3 days later they uncapped our meter so now we have gas. For 3 days once the meter was on we could smell gas on the boiler it says danger do not use. Under the sign it says (opened end fitting in living room) now this is where it get fun! We have a massive gas leak I had two blokes turn up and they sorted the whole problem 6 hours later. They did say another 24 hours you wouldn’t be here! My question would be can I sue, can I get the gas company in trouble and who do I speak to. Thankyou