Garage sitting on freestanding block with no mortar. How to fix?

[Dane C Allen]

I have a duplex with a detached garage that has a slab (not in the greatest shape, several cracks), but the structure itself sits on concrete block surrounding the perimeter of the slab. The block is dug down and I think there’s 2-3 layers or so, but it appears to be freestanding with no mortar holding it all together. Moreover, garage walls are bowing on 2 sides and it almost looks like the walls are sliding off the concrete block. Any ideas on fixing this issue?