Quote From grizzle:
it is useful to think about the problem from different angles.
Here is another perspective:
It is unfair to simply point a finger at one person. It is also possible that an university has certain system issues.
For example, students may have two supervisors. If one is busy or incompetent, then seek help from another. In addition, serious issues could also be resolved during Confirmation of Candidature or yearly review...
Some universities may encourage interactions among PhD students, thus they might even vet or discuss each other work.
In your case, perhaps the co-ordinator could re-assign someone to help you in this last stage.
Or internal examiner could be a bit more proactive under the request of HOD.
That is, your success is also dependent on the "system", not just ONE person or bad supervision.