Nedbank Cellphone App - Prepaid Purchases

I purchased R299 Vodacom Data via my Nedbank cellphone app, on 29 April 2019. The money went out of my account, but data was never received. I phoned Nedbank to complain - 29.04.19 / 30.04.19 / 13.05.19 / 20.05.19 / 23.05.19 / 29.05.19 / 04.06.19 AND 18.06.19 - I keep getting told that it is still under investigation. It should not take THIS long to sort out an issue. Data was never received so funds should have been reversed into my account by now. Cannot understand how it takes SO long to sort out. I am a pensioner, so R299 is a lot of money to me. Frustrated and disappointed in the lack of care and/or service to getting this resolved.