Quick data depletion

I logged in a complaint regarding my data depletion discrepancy.

I have a 60gig data plan contract with MTN, I was informed in store that 20gig is the day data and 40gig the night data. I realized that my day data was depleting even during the night. I logged a complaint they promised me correspondence within 72 hours. Mind you I called them the 21st Sept 2020 and I didn't get any correspondence. I called them back today the 5th October only to be told that the response on their side indicates my data is depleting accordingly.

Additionally, I was told that 15gig of the 20gig day data is a promotional anytime data which will deplete even throughout the night. And that the 40gig night data has a 30gig promotional data that depletes through the night as well. What I do not understand is how both data depletes simultaneously.

Also, checking my billing statement from the past 3 months, the depletion of the data is different now. Previously at a time period of 30-45min 100-200mb would be depleted. Now in a time frame of 15-20min 400-500mb is being depleted, which explains why data is depleting so quickly. In this instance, I was told to contact Netflix for the charges because MTN only provides data.

I compared the usage with another service provider to see if I'm being unfair. The consultant could not explain why MTN is reportedly 'charged more by Netflix' whereas another service provider is charged less. All I got was 'your data plan is depleting correctly' and 'we are sorry, keep track of the data and if you experience the same problem contact us again'.

Displeased by MTN shame, even the customer service!