Non exsistent service

I purchased R50 airtime at an ABSA ATM. Thereafter I tried to purchase a 5 day data bundle of 250mb for R25 with the R7 boost. It kept on saying the transaction was successful but nothing happened. I called the customer care line 140 and I was told to switch my data off and to power off my ph. I tried this a few times and still I could not purchase what I wanted. I went to the Cell C store at the Golden Acre and a very friendly lady assisted me. She also tried purchasing the required data for me on my phone but no joy. She called numerous people as well as the technical department but no one can explain why it does not want to work. There was sufficient funds available. After spending an hour there my USSD was blocked till the next day. After that she purchased me the 5 day bundle 250mb for R25. As my account updates on the 1st of the month I did not want to waste R30 on a WhatsApp bundle. The fact that I could not boost with R7 extra is unacceptable as it is a service that Cell C offer. So I lost out on an extra 250mb data. The fact that no one can tell me why it will not work is shocking!! The least Cell C could have done after an hour of waiting was gift me with an extra 250mb data if they could not resolve the issue - so as usual the client loses out!!!!!!