first, I bet you learned an important lesson on paying attention and details.
as for the cable you didn't say if it was installed in a conduit or not. you say a cement wall and the way you phrase it sounds more like the concrete was poured over the cable that is now the wall.
if it's directional, i'd say your out of luck, now, i'm sure people will tell you to cut the ends off and swap them but, it might not be that simple and you then always run the potential of the thing failing once modified.
so, if there is no way to remove the cable and put it in the correct way without damage to the cable itself or the connectors i'd think you might be out of luck. you might have to suck it up and run it exposed as neatly as possible. mistakes can be expensive. sorry about all of that, but, if it were me and I messed up like that, and there was no way to remove the cable i'd just run it exposed like I mentioned.
best of luck getting it resolved, keep us posted.
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