"I got ... the wall" does not make obvious sense with either "in" or "at". I am not sure what you are trying to say.
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xnon3so what is the difference between 'in' and 'at'The general question is too big for me to answer here. See the definitions and example uses in any good dictionary. I could try to answer a specific question, but I don't understand your "wall" sentence or what situation you are trying to describe.
xnon3 do u have skypeDo you have Skype?
Anonymous do you have skype is okNo, it is not OK. It is an incorrect stream of unpunctuated and uncapitalised text. See my previous reply.