Hey Razz, 

The security deposit fee is only refundable fee if you are not alloted any college in NEET AIQ counselling.

The refund will be done after all the rounds of AIQ counselling are over and afterwards MCC release a list of candidates eligible for refund and within 15 days of publishing the list you will get your security deposit refunded.

You can expect the refund upto October 15, 2019.

Good Luck!