IDP IELTS — Refund money

I registered my IELTS test with College Canada and I experienced so many problems with this college. I already paid to it $757 for one IELTS Test.
First, I booked one on 6 MAY and then they reallocated me to 29JUL ($336). Then, I request to move to 29 May, so I paid ($336) for this test. They then reallocated me to 6 Jun.
Finally, I paid my cancellation of $85.

Now I have not received any refund yet. I am frustrated with their poor organization. I am writing this email to ask for a refund of $336+ $85.