Data not received

I bought 500mb x 2 (as it appears on the app) on 17 August2017, A week later I noticed that i didn't receive all the data, only 500mb x1. Now this is the second time this happening to me. Today I phoned vodacom to complain, after investigation they confirmed that I indeed did not receive the data but it will first go to the solution department and it will take three days to complete. Why 3 days, my money was good enough immediately, the missing data was identified. Vodacom is becoming the worst operator. My contract is coming to it's end, guess what is going to happen.