Recently, I've answered this question:
which exactly answers the question. The answer got accepted and the OP started to ask follow-up, not related to the initial problem, questions which I initially tried to answer.
Then, I tried to politely asked to ask a separate question instead of using comments:
okay, let's avoid using comments for solving separate follow-up issues, please. Consider creating a new question if you experience difficulties. Thank you for understanding.
Then, after not getting a comment from me, the OP just unaccepted the answer.
I guess I need help of the community: What should I do now and what should I have done better to avoid ending up in a situation like this?
Update: The question author just posted a new question.