Horrible service from Vodacom

Hi I am very, Displeased with the service I receive from Vodacom, When I did my upgrade to the new line they offered me a bonus extra 5 gigs that came with anytime data and night data. I then purchased an extra add on of 10 gigs in the month of August 2020. and to my surprise, this action caused the bonus data that I use to get to fall away or be canceled. No one told me that purchasing additional data will cancel my bonus data. and now I have been trying to call the contact center to get them to reverse this action as it is not my fault. instead, there is no one who can help. One urgent told me that they reinstated my original 5 gigs only to find that they actually added a new expense to my contract. , Please I need this to be sorted out asap my ref: ***. The urgent who assisted me with this upgrade never explained to me that buying any additional data or add on will cancel my bonus data.