MTN deducting nite usage from day bundle balance

I've suspected MTN of deducting nite data usage (0:00-04:59) from my day data. I've called in a few months ago and was brushed off. I still saw unusual usage and decided to check for myself. At 00:05 on the 5th of August, I checked the balance and I had 10GB available. I set my apps to update and went to sleep and woke just after 5am. I immediately checked my balance and now I see I had 6GB remaining and over 49GB of nite data out of the 50GB allocation whcih was the same balance I had the night before. So day data balance showed 4GB less and nite data remained the same even though the usage was in the nite data time. So that means that MTN was deducting nite usage from my day data and this has been going on for months. I want my data to be returned to me and I need to be compensated for all the months that this has happened. I called in customer care and an agent escalated to technical with reference SMC/*** I need this rectified please.