Cell C Get black Useless App

I found the new Get black service offered by Cell C and bought 10 GB data just to try it out . Buying the data was as easy as buying normal data. I downloaded the Getblack App tried to sign- up and the App crashed tried to sign up several times same thing happens. I got a problem cause I spent money to buy the data and I can't even use it. What kind of a business is Cell C running. So my money just went down the drain just like that. I wouldn't recommend the service to anyone after my experience.