Bad communication

I was on a 24 month contract (7.5gig smart internet). I kept on running out of data so I started using once-off data bundles.<br> I bought a 50gig once off data bundle in December 2015. It is stated that the once-off data bundles is valid for a period of 12 months. I then filled in a cancellation form stating that I want to cancel my contract at the end of my 24 month contract and would like to stay on pre paid and also mentioned that I just bought a 50gig once-off bundle. <br> So now at the end of my term (the end of Feb 2016) my contract was cancelled and now it seems that I have lost the remaining 24 gig of once-off data. The least that I expect is that somebody at cancellations would inform me that I would loose my remaining once-off data, in which case I would have asked to cancel my contract after my pre-paid data got depleated. I really hope that Telkom can rectify it as 24 gig is allot of data to lose.