Where is my night data

I bought a 40 gig contract with Telkom Aug 2018 special and they have delivered it with extra 40 gig night data as per contract. But since March 2019 they haven't loaded my 40gig night data and I have sent enquiry via the app no response tried calling am being kept on the line. I demand answers about where is my 80gig of data that was supposed to be loaded this month and last month