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I honestly think, and I am not a mason,
that the only right way to fix that is to have the wall done over the correct way, because what is behind the wall is washing away through it, so if you just fill in from the front, the wall will retain the water and will crack out again when freezing.
so there should be scuppers in the wall to let the water drain through to the other side or drainage behind the wall
What is happening is the water builds up behind the wall and found its way out between the rocks that would not move, that wall will be under a huge load if you block up all that open space. You either have to put drains in it or fill in behind it with drainage stone and have the water travel underneath the stone.
My disclaimer:
Sorry to tell you that, but again I am not a mason, but have seen it before, and do not claim to be an expert
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