IIBF — GST RECOVERY amount recovered many times.

I am a Member of IIBF with membership ID[protected]. I wish to apply for JAIIB exam. But every time I try to apply for the exam, a GST RECOVERY amount of Rs 270 is collected from me to proceed. Till now I have paid the GST Recovery amount 3 times. Every time transction is successful but still ask me to pay GST RECOVERY amount. I have sent many Emails to IIBF, but I am getting no response.