How can a Christian woman claim her Mahr from her Muslim husband?

Dear sir/madam,

I am a Christian woman married to a Muslim man under Islamic Marriage in Dubai Courts.

My husband wanted to divorce me but he insists on me filing it. Until today, I have just realized that there is Mahr involved from which I haven't received anything during the marriage.

Am I eligible to get that as I can see that this is my undeniable right as his wife?

Please correct me if I am wrong, and I needed help on this!