MTN night express data not utilized when logged in at night

Such a horrific experience i had with mtn. I have been complaining since March 2020, a month after I upgraded my contract to a 40gig data only sim. When using the night express data between 12:01 and 04:59, it takes from my anytime data and not the night express. The only time I get to use the night express data is if I run out of anytime data, should I top up the data, it utilizes that too. Im so frustrated as you can't get to talk to the 'technical team' that always gets back with ridiculous feedback having to wait 5 working days for a response each time. Ref SMC/***. This is a known issue as per user's previous complaints, I do not understand why the technical team is unable to resolve a known problem.