Club Mahindra Holidays — holiday gift voucher

The voucher is having voucher no. But i couldn't register for it because the window is unavailable for any further registration.
The pop up window is opening by using voucher no. But it is asking for redemption no. And redemption no. Is not available until you register.
When i tried calling them, the paid call was on hold for half an hour.
If you have any suggestions, please let me know.