Mtn *****ing my data and airtime

My mane is Tshepiso Matlapeng MTN account A***<br> I have a problem with airtime that disappears to I don't know where to, On Friday the 11th September 2015 I bought R30 airtime around past 7 am from that amount I bought 10 MB using 12 the was left with R18 when checking balance during the day it was R0.00 called in and spoke to Carlton Mulauzi who gave this ref number *** was expecting feedback on Sunday as I was advised SLA is 48HRS.<br> Today spoke to Nompumelelo who dropped my call ,called again and spoke to Zoxolo Zibazi ref *** advised that the airtime that I get for my contract every month on the 14th has disappeared last night I had the R210 I have not made any calls balance is sitting on R61.23 cents from Monday I only used the data what surprises more is that I use FREE WI-FI from work during the day I switch off my Data she advised that the department has not opened she will call me back 9am and can still see the 1st incident is still open, I waited till 12:45 and called back.I spoke to Candice Kannemeyer ref *** who I gave all the ref number and she advised that she cannot see the transaction on the system of where my airtime disappeared to?REQ***