If that is the case, u can contact grab. They should be able to assist you. I called them a few months back when the app had some glitches and I couldn’t key in the field for my mobile number and they rectified it.
I had the same problem, redeemed 1 voucher using my mobile number but STAR$ didn't show up on my Capitastar app. I wrote in to Grab for help but they were only able to confirm that I had successfully redeemed the voucher and redirected me to Capitastar for clarification.
