I want my airtime and data back!!!

I recharged with R50 airtime yesterday at around 17:30 and I bought a R12 data plan (I had data still prior to recharging). About 30 minutes later I loaded another R50 airtime and had a balance of R84! After an hour or so, my data was depleted and I assumed that it was the data that was there before recharging. My battery was dead for most of the evening and I started using my phone again after 11pm then I slept. Used my phone again this morning and I bought 60mb of data after 11 this morning, I continued browsing for a bit, Facebook, WhatsApp just as I normally do. Then I got a SMS at 13:08 saying I have less than 4mb remaining. I assumed it was the 30mb that I bought yesterday, I checked my balance nonetheless, only to find that I'm not only left with 1mb of data but I have R7.28 airtime remaining!!!!! I called 111 and ***6 but I'm not getting any explanation. When I checked my data usage, I've used 135mb from yesterday to today!! So where is my airtime???? Because even if I was browsing out of data at any point, it couldn't have cost me R70 worth of airtime!! I say this because between yesterday afternoon and today, I've had about 116mb in data, so where is my airtime????