MTN Still has not refunded me my airtime

I have a prepaid sim card with mtn and twice I have \lost"R15 airtime (R15*2=R30). I have previously complained on hellopeter and I still have not been refunded. The REQ numbers for the 1st two complaints are : REQ:*** and REQ:***. MTN initially responded by saying I had opted into some marketing-I asked for proof-nothing. Then after I complained about my airtime they told me they have already responded. So MTN"