Referral system needs to be improved. Review on Taskbucks

At first when a friend of mine referred me this app. I looked at the app and the apps idea seemed like great, an app which pays you through various online wallet. I installed various app and got paid. I was very happy with the app until, I referred two users. Both of them installed the app in front of me. For first friend I received money and for second one I never received any money. I thought there might be an error the way I referred so I thought to give it a shot once again. Again the same happened, I don't know what the problem was.

After some days for some reasons I have to reset my phone. Once again I installed this app tried to login with the same number and all the money I earned was gone.

I guess every time they think user is signing up and there is nothing like login on their side.

P.S: My suggestion please redeem money as soon as you receive it.