Uber Eats ****s us with their vouchers.

I have been winning voucher from my dstv rewards. Vouchers from all over and i have been able to use others from other services providers but uber eats. The worst thing about the is even if u ask for help from them u never find it, i don't know if they don't know their systems or whatever the reason. I am so angry because it somehow feels like they were never trained to solve customers issues. I have lost over R400 vouchers with no help from them.