Data depleting incorrectly

I have been upgraded to the Telkom 90gb +90gb lte package. Since then, I had to ask for the additional 10gb to show on the balance check site. This month I now see that most recent allocation (expiring end Dec) gets used first, and oldest data (expiring end Nov) is untouched. This is against the information on their site which states that rol***** data will deplete first. I have chatted to THREE agents who can't seem to understand the problem... Webafrica, I have been a customer for a few years now, and would like some service please.