Disappearing data

Good day, I have been having a problem with MTN for a few months. My data has been disappearing without me using it and I haven’t been monitoring it but this month it is worse. I got my bundle of 20GB yesterday and all of a sudden, 10GB has gone within one day, adding that I haven’t used my phone much(using most of it after 12am which is meant to be night data). I need a representative to tell me what’s going on because we’ve had to purchase many bundles over the last few months and the daytime data is used during the night which isn’t fair.

Please get back to me ASAP with this request.

FYI - we have taken up another contract and we’ve had no communication from anyone in the last 2 weeks but there was a lady who has called to migrate my number which isn’t what I wanted but I’d like some clarity on both issues.

Thanks.