CashU is a bad way to buy Bitcoin in the Arab world. If you want a quick solution, it is better to convert those cards into the local currency, buy bitcoins using the local currency, or buy any gift cards and try to sell them for bitcoin.
This is a good option if i were in a company where people frequently use CashU. I am from Tunisia and we have one official CashU seller who almost sell all his product in the middle east countries.
I do not know what your country is, but I see some groups that sell CashU for bitcoin using Egyptian pound, the Saudi riyal, and the UAE dirham, I am not sure of the rest of the countries.
Unfortunetly, i didn't find available sales with Tunisian Dinar.
I think this is what i am looking for. Please send me links to local facebook groups if you know any because i can't find local groups from other countries than Tunisia. Thank You HugeBlack. Great response as usual