IIBF — Neither confirming membership nor issue Refund of my payment

Address:	Kohinoor City, Commercial- II ,Tower-I, Kirol Road, Kural (W) ,Mumbai- 400070
Website:	www.iibf.org.in

I had applied for enrollment in the IIBF in February 2021, despite of completing the registration and paying enrollment fee, i have neither received any confirmation on my enrollment nor they are issuing the refund, i had had lodging complaint in the IIBF site, even i continuously called them, either the number will be busy or they wont be picking any calls.
one month back i received a mail, stating that issue will be resolve in 7 to 10 day, still it has not resolved