MTN wont take responsibility for missing airtime

MTN seems to think its a joke how they respond to requests. Your customer service has proven to be really weak and questionable. I sent a complaint about my airtime and data disappearing and your have the nerve to send me a dump of my usage for the month, That's information I already know. What I don't know is how on 30 October morning I lose R147 and 500MB data within an hour when my phone is one WIFI connection during that time with both cellular data and 3G OFF, no phone calls made during that time, in-fact my phone was not even in use in that hour until I got an sms from 141 saying my data is depleted, I check balance and zero balance. I don't want you to send me an email with my usage for the month I know what I do with my phone, I want you to investigate what happened to my data and airtime, and refund me my data and my airtime, This is the second time this happened and I am not the only customer complaining of this. Is MTN trying to pay off its fines by de*****ing its client. Please refund me and let me be. Stop giving me nonsense excuses.