Your best bet is with the shop that sold you your glasses, six months
ago, as you say.  They have an ethical, if not contractual, responsibility.
A third party undertakes mainly liability, and might prefer not to touch
them, particularly if they seem real messed up.

Through the years, I have learned to make simple adjustments to my
frames.  I think it is worth doing.  But I practiced on old frames to start.
I do not get new frames each time.  After a few years of tweaking, they
can fit pretty well.

You can wear out your welcome with your Eyecare Professional by
being fussy about your eyeglasses.  They are busy people.  Except
the ones here debating with Aceman and Otis.  They are probably not
too busy.

--
Dicky