IDP IELTS — Exam dates getting changed

After I filled the form in October and selected my exam dates it was postponed to December. I wrote a mail to the concerned authority and changed the dates but they themselves postponed it again without my concern. The third time the link did not open, even after trying multiple times. I wrote a number of mails and made many calls but the staff is awful. They are not giving me a refund, forcing me to give the exam. I am a student, and 14000INR is a huge stake for me.
Regards.
Thanks but no thanks.
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