Vaguley worded contract & unhelpful customer care

Hello Peter<br> <br> Im very unhappy about the Vodacom Customer Care service.Last week Thursday (21st May 2015) my husband informed me about Vodacom's Pay Once Prepaid Data bundle.I decided to try it out and attempted to purchase a data bundle for R999 and assumed I would receive 1gig per month for 12 months.Instead,I got 20gigs of data all at once in one month and then received an sms saying that the data will expire in 30days.There is no way I can use it all in 1month.I've phoned Vodacom numerous times however, they were unhelpful.This is extremely frustrating.Ive spoken to a woman, Thembile who said she will phone me back.I waited 3days but received no call.Ive spoken to other consultants including the Supervisor,Lucas who promised to resolve the issue and call me back,however I received no call.I would like for this to be rectified where I could have the the package I intended to buy which is 1gig of data every month for 12 months.Im a student and cant afford to spend another R999 to get the correct package.Ive always had great assistance from Vodacom up until now.I once had an issue with Cell C and they resolved it quickly.Why cant Vodacom do the same?<br> <br> Peter? Please help me<br> <br> Student