How to write JQL to search the QA bugs that are not created by my and its comments include a number

[Jumana Haimour]

project = MIT016 AND issuetype = "QA Bug" AND assignee was not "5fd78007208dbf0107c525ff" AND comment !~ "27" order by created DESC

Im using this JQL to search the QA bugs that were not created by me and i didn't post any comments on it ( all comments i post have number 27), so i used (comment !~ "27").

It is working but not as needed, where it is not includes in the search results:

1. The bugs that doesn't have comments at all 

2. The bugs that i commented on and the comment include 27 but the comment is not the first comment on the bug.

Could you please help me?