Who was ur agent and did you show money?Anyone who believes that PTE is the root cause of refusal is unaware. I got my student visa for may 2019 intake on 21 Dec and submitted my PTE score, upfront medical, one year fees and gic certificate. In short file went through SDS. If your college / university accepts PTE and you have met their score requirements then visa officers don't object.
Order for caips notes and you will get the reason, it must be something else.