Burst pipe in my flat

[snowhead]

It's unlikely that turning those valves off have caused a leak but there would need to be more information as to exactly what and where the leak was.
Are you going back or is someone sorting it out, get pictures of the location of the leak if you can.

 

[WC1]

If your plumber is reputable he'll be able to talk to you what happened and how you can stop it happening again. Do aks him and do let us know what he says. Wc1

 

[Scott_D]

What do the labels on the red handles valves say?

 

[Colalok2002]

They say “cold shutoff” “hot shutoff” anf “hot water shutoff”