I'm very angry with the data bundles from MTN

I bought the MTN ONE DAY UNCAPPED DATA BUNDLE for R40.After then,I was told to activate the bundle by dialing *141*5#,in which I did.Unknowingly in order for me to activate that bundle, there must be some airtime in the phone.When I activated the bundle as I didn't have airtime and didn't know that I needed to have airtime to activate,I got the responee saying failed to activate bundle.I started Googling why and only came to realise that I needed some airtime when activating the bundle. So I bought some airtime,when I dial *141*5# now it only had an option for me to deactivate the bundle, in other words it has already been activated.So I thought its all good now,bt only to realise that the airtime is the one being used up.Now stressed, I tried deactivating and reactivating the bundle,bt when I reactived the bundle it said you have nt purchased any uncapped data...I know R40 is little to most of you,but I'm still a student and that R40 I got it very hard, I don't even know when I'm gonna get it again... Please MTN,we are really affected down here.