Need a solution to fix something to a wall

I have a wall in my room, which I thought was concrete, I need to drill 3 holes to make a triangle shape to attach something, it needs to be able to resist at least a pull of 25-30kg. I tried drilling and the wall just crumbled and my second hole got connected to the first, absolute disaster. I am not even sure what is the wall made of in the end... This is what happened If anyone can suggest a fix, not just a way to fill the holes but rather so that I can still use the same place to hang the thing I wanted to hang on the wall... via /r/DIY


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