Paid but data bundles have not appeared

I went to Vodacom store and bought data bundles for R99.00 on the 29 May which was Friday. They ask for the number where bundles will be loaded and I gave the cashier. I was told that the system is slow and may not update same time. The weekend passed and I could not access the internet cos the bundles had not updated. On Monday afternoon I checked ans still no bundles call Vodacom call centre and was told that the system does not show any purchase of data bundles. I then went to a store and asked for a refund but was told it was not possible to get a refund after the sale went through. I asked them how it went through if it did not even register with the network. They said they will reload it again but will not refund me. I left the store and the till slip which has the sale and the number that must be loaded with data bundles yet to this day I have not recieved the data bundles.