WOW BONUS MISLEADING

On a number of days , l have received MTN's WOW Bonus airtime expecting to be charged 2 rands a minute but to my surprise they charge me more and each time l call their call centre l am repeatedly told to call again after 2 hours because their system hasn't updated till the day is gone. Today l received R100 WOW Bonus airtime around 9am and used it all on about 30 minutes, l called their call center and an agent called Shane (who wasn't listening to me) assisted me but in reality he didn't assist me, told me the same thing to call after 2 hours despite pleading with him that this has happened before and can't spend the whole day calling MTN simply because their system takes forever to update. lts 3pm right now and their system is only picking a call l made at 7am. Since this is not the first time l have had problems with their products, l am obliged to ask- DO THEIR PRODUCTS GO UNDER TESTING FIRST TO MAKE SURE ALL IS WELL BEFORE THEY ARE ROLLED OUT TO US OR THEY ARE USING OUR AIRTIME (LIVE ENVIRONMENT) TO TEST THEIR PRODUCTS?????