Once of data not allocated

I upgrade on the first of February 2018. On the upgrade there is a 20Gig once of data bundle which i have not recieved yet. I phoned customer care and went to the shop where I upgrade my contract in witbank highveld mall. The logged complaints and for the last two months they keep on saying i will get it on the first. It is the first again and still nothing. Better to cancel contract as i have not recieved anything. And the breach the contract.