/diy/ - Do It Yourself

15 years ago my dad put up a clothesline in the washroom, by drilling into the already then old concrete wall. It's now come loose since he used an undersized screw and a shitty plug and now I get to fix it for him. And then do his laundry.

What kind of a plug should I use to get it to actually hold? I want to be able to put a load from the washer on there without worrying about it. And how do I patch up the old holes? I assume that drilling out the old holes in a slightly larger gauge and reusing them is a bad idea.