Hey himanshu!

Freezing means that you are satisfied with the alloted seat and you do not wish to  participate in further rounds of cojnselling. So , in case you do not freeze your seat , you have three options:

1) you will move to the further rounds of counselling and you will have the options of other rounds of counselling only . And you will lose  the allotted seat in this rojnd of counselling 

2) you accept the allotted seat. In this case , you have to report at the admission centre for getting admission 

3) if you do not freeze , then the default options of first round of counselling will automatically apply  to this rojnd too.

But none of the cases mean that you will not get a seat. You will get a,seat even if you do not freeze. 

Hope i have resolved your query!