Thank you for your reply.
I am past the warranty (mine was handed over in 2013).
so if i understood you correctly, in your case, it involved digging/excavation. That's what i feared
kaushen79 wrote:
Hi there, I had the same issue.
It turns out the builders left the metal pegs in the concrete when it was forming.
Looking at your picture, I can see two rusted metal pegs mid-way up your wall.
I suspect there is another one down below where the concrete is saturated.
The builders came and removed the pegs and filled the hole with a resin injection.
Mine was under Tarion Warranty when it happened.
Good luck.