replying to asis, Iggy wrote:
The video link didn't work for me. But, you call the plumber back in to fix
their error, at zero cost to you. Only they screwed up and only they should fix
it. However, if you want to see how it's done or want to attempt the fix
yourself, see this video "How to cut old and install new shower drain"
You must cut off the wrongly installed shower drain flange and install a new
flange correctly, there's no quick-fix or short-cut. The linked video ends with
backing installed under the flange, in your case you may have to chisel or grind
the concrete down for the new flange to fit how it should.
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