As far as I understand, the journal reviewer has asked for a language proofreading for your revised manuscript, which was edited by a company. I would suggest that you re-edit the manuscript instead of mentioning that it has been edited since this is already stated in your manuscript. The reviewers are probably aware of this and still want you to re-check the editing.
You could contact the company that edited the manuscript and inform them about the reviewer comments and request for a re-edit by an expert. You should also consider getting it cross-checked by a colleague or friend who is an expert in English language. If these options are not available, you could consider professional editing services offered by other reputed companies like Editage.