"...which rightfully belongs to me in the first place"


Willingness or even desperation to get funds returned is understandable, as you have no
leverage.  But the TOS states:

"Once a deposit is made, the funds transferred become the property of DGEX.com and the client can hold no claim for the funds displayed on their DGEX.com account should any unforeseen circumstances occur. "


So as soon as you made the deposit, the funds were no longer yours. The second phrase is subsumed by
the first, and certainly unclear however in any case, the bar  of one 'unforeseen circumstance' is quite low
and defined completely by them.

Whether such an agreement could hold up in court is another
discussion, but on the surface, once you made the deposit the funds were not yours to reclaim
Anything returned to you was superfluous.