Vodacom problems with app sales of data

We bought two x 2Gb data bundles via Nedbank from the UK for a visit to South Africa. The option said R149 for a month Both my husband and I was dependant on the data for communication. We then received sms's to say no its only for a few days not a month -i tried the customer care and the Tobi bot but no success -so bought 1x R149 option again for myself and a 4Gb option for my husband for a month -this time his went the right way by my R149 option again let me know I dont have a full month as indicated with choices on banking app in the last case Capitec. I then bought 4Gb for myself but the point is I lost 300rands and had to take an option for nearly double the price just not to loose again. Bodacom has a problem and I pay for it -i woul at least want my money back i unneccarily spent! I should say that in each instance i contacted customer care with no luck and the last time i spent 40min with a nice lady from Stellenbosch Square -please advise this cannot be happening