England - Oven glass shattered and my landlord is forcing me to pay for it

I'm currently a student living in a student accomodation at Leeds. The inner oven glass shattered while I was doing normal cooking. The apartment manager came and inspected the issue and said I'm liable of paying the cost of fixing the oven because and I quoted "the glass in the oven does not normally broke" and the cost of reparing is around 190 pounds.

I'm really confused about that because I'm doing nothing but normally using the oven and that's probably a spontaneous glass breakage and isn't it the apartment's responsibility to repair the oven?

Already wrote an email to escalate this to higher management level. But any subsequent advice on that?

Thanks!