Still waiting on AIRTIME REFUND - POOR SERVICE

I bought airtime from Vodacom and converted it into a data bundle. Long story short my data disappeared after speaking with 3 consultants a manager requested that I send the proof of the data purchase. An hour later i received a call where I was informed I will receive my refund in 24 working hours. I called on 30 July 2015 and every time I contact vodacom they want me to restart the process even after attempting to call the manager who dealt with my query. I have a service number and yet no one can assist me. Very poor service, I would not recommend Vodacom to anyone