Is it a new thing where you need a TM30 to extend? In all the years or visiting Thailand and a hell of a lot of visa extensions I’ve never needed to take a TM30 with me 🤷♂️
I’d put it too them that if you get it fixed yourself will they take it off the next rent payment. Failing that be extremely firm that if it is not fixed by a specific date then you won’t be paying the rent