Failure to provide statements

So it's been a week and still no response from MTN. Last month when my debit when off I was charged double the amount of my normal installment.When I got my statement they told me I used out data bundle and I requested another statement and but still nothing. I email their customers care and I phoned numerous time but still I'm not receiving any communication from them what so ever this is really frustrating. They double charged me for data I was supposed to get when you take out a new device but I can't get I any statements as to see where and when I used 20gb of data