In that particular case you will have to consult the contract you have with the school. If the school claims the sim is approved but the authority says it's not then the problem lies with the school.
You will have to negotiate with the school to find some way to make up the shortfall. I would however advise to find a way to make up the shortfall meanwhile in order to get your licence issued and be prepared for a long argument if any of the previous posts about this school are anything to go by.