Daytime data purchase credited as night time data.

I buy my data using airtime since the app has been giving problems. I bought the 20GB for R150 per month twice hoping to get 40GB in total, what happened however was my first 20GB was properly put to daytime data,\I only realise to day that the 2nd R150 bought 20GB data that was credited as night data, now no one works at night and my operations have come to a halt because data I though would accumulate was instead split between daytime data and night time data.

I would want Cell C to take my extra 20GB from night data to daytime data because I bought it as daytime data on the USSD prompts.

The LTE number in question is ***

Thank you