Billed out of bundle rates when data is loaded

I purchased 1 gb data and R60 airtime. ( balance R62). I loaded my airtime around 5pm and my data around 7pm. I made a watsapp data call to my dad after almost immediately after I loaded my data. I checked my balances after my call and noticed my airtime was down to R40.79 and my Data is still at 2gb (1 gb promo). I phoned 173 to first operater Zinclere. I explained what happened she said please hold the line who kept me on hold for 10 minutes plus. I cut the call and phone again explained my story and get told I loaded my data less than a minute AFTER I made an internet connection. I was told that the system takes 2 to 24 hours to update. No refunds are made because the system show I loaded my data after I made an internet connection. I asked to speak to supervisor and placed on hold for over 20 minutes (with music) then it starts ringing and the call gets cut on its own. I been a loyal mtn subscriber for over 10 years now and 4 years on this number. I going to port my number to cell c. They have cheaper rates anyway. All because there system takes long to update yet I got sms from mtn stating I loaded my data bundle. I am out 22 bucks.