Hi
Postgraduate tutor (or Chair of Postgraduate Studies) is paid to help with things like this, I don't think they have an excuse not to see you because they are "busy". In principal, I don't think you can find anyone who is not busy in an academic environment.
By all mean, if your postgraduate tutor is busy, you can talk to your Head of Department (HOD). For any reason, no one in your department can help you issue with this, you can go to your university Graduate Association or Welfare Officer, they will help you to discuss this issue with the department.
I hope you can sort out this soon, I understand how annoying it can be when your supervisor is not being supportive, and I regretted didn't go to this option during the early stage of my research.
It's always better to solve this soon rather than later!