...I am really not happy with the service
Well, sort out the discrepancies or difficulties you have with the ATO. Approach the ATO with the options you think could remediate the situation and advance your training.
Your best option (even though I lack the full picture of your circumstances) is to exercise more concerted effort to bring your training Endeavour to a successfull completion.
Yes, you can do it. You paid for it because you had the determination to achieve your pilot certificate. Don't let psychological problems deter you from attaining your goal.
Go for it!
Good luck
WP