Billed me for subscription I did not receive

I have subscribed for recurring 250 MB data bundle last year so last month I decided to subscribed with 1 GB it was on the second of February , the 250 MB was already loaded and I did not got that 1 GB got it on the first of March and debit order is going on the 15th so, to my surprise Vodacom charged me the two 2 GB data bundles of which is for February and March whereas February they did not load that other GB. I called vodacom and they say they ca not load 2 recurring bundle but they can take money for two recurring bundles. My heart is broken they treat the customer. they did not explain that they can upload two recurring bundles when I subscribe.