I understand how frustrated you must feel.
However I wanted to relay another possible side to this.
When we are out of town the assistants are under very strict orders NOT to jump anyone up above 3’. Nonnegotiable.
The clients are told this and we are never gone more then 2/3 weeks.
This rule would be especially stressed to a client trying to move up. Moving up can be filled with pit falls without proper guidance.
Our assistant instructors are solid and great at teaching the lower levels. When we are gone the lesson plans are discussed and focus on basics and building strength.
Could this be your trainers plan but he failed to communicate well?
I don’t know what we would do if we left clients home alone for months.
Good luck, I hope you find a happy solution to your frustration.