Bundles and airtime taken away

I am a very disappointed customer, the past 2 weeks I bought bundles & airtime & they were taken away 1st week I bought 100MB for R35 & they didn't last a day & I use internet for social media ( what's app, facebook, Instagram &Twitter & yes I always log out and during the day I don't really use it because I am at work, It did not show at first that they were gone when I was making a call it said I dont have enough airtime to make a call & I was shocked as I bought R5 airtime and I restarted my phone it showed 00MB and airtime R52 and I knew I didn't have that much airtime as I only bought R5 airtime, I purchased 300MB for R85 & R5 airtime again but those only lasted 4-5 days & I usually buy & use them only for social media and they usually last up to 3 weeks, it said again I dont have enough airtime, this time after restarting I had R59 airtime, I called MTN 1st consultant told me its because of the internet and I told her I have not logged in any other sites, I asked about the airtime she said its WOW bonus & I must dial *130*555*01# and it said I have not joined, 2nd consultant said I must dial *130*501*01# it said I did not join meaning they also dont know they were fumbiling