Excessive Data Loss

1GB and 10GB data disappearing daily. Can't access email. Contact 135 no assistance. Was told data was consumed at time when the devices were off/apps were off (apple device). MAC addresses limited to devices, password enabled on wifi, hotspot never in use. Escalated to MTN *****line to investigate potential for some type of *****/sinister event coinciding with excessive data depletion/loss. I was previously on a 5GB bundle and never exceeded 2GB - I'm now on 20GB (after recent upgrade) 10GB day/10GB night and never have data. The MyMTN app doesn't reflect the 10GB day time data nor the supplementary 1GB prepaid bundle loaded 1 November 2018 (that has also vanished almost instantly after loading). I've done sim swaps but still the challenge persists. Call agent today called out a number that did not belong to me which is also concerning.