Vodacom's service is disappointing!

Yesterday I bough R30 worth of airtime from the My Vodacom app using Masterpass. The airtime has been bought according to my bank statement but has not been allocated into my account! When I called customer care, the lady told me to call my bank. How do I do that without airtime? And besides I have encountered this about two months ago so it is clearly not an issue on my bank's side. The last time they sorted it out! Vodacom, do better!