Which is the law applicable for debt collection in...

The creditor can file a lawsuit to claim the debt before the civil court
Judicial fees shall be an obligation on the party obligated by the judgment for the expenses of the case, at the rate of (6%) of the value of the case, provided that its amount is not less than (500) five hundred dirhams, and not more than:
1- (20,000) twenty thousand dirhams if the value of the lawsuit does not exceed (500,000) five hundred thousand dirhams.
2- (30.000) thirty thousand dirhams if the value of the lawsuit ranges between (500.001) five hundred thousand and one dirhams to (1.000.000) one million dirhams.
3- (40.000) forty thousand dirhams if the value of the lawsuit exceeds (1,000,000) one million dirhams.

For debts, the UAE civil law applies