No SMS pin to withdraw cash. No feedback from Momo

On 2 December I requested a cash-out of R2 500 from the Momo app. I received a confirmation SMS stating that I would receive the PIN needed to withdraw the cash from a Nedbank ATM. However, no PIN ever arrived. I logged a complaint on 3 December and was promised the PIN, but three days later I have still not received it. This delay is unacceptable and is negatively impacting my cash flow.