MTN prepaid customer service is bad.

MTN has got a worse service, their service is beyond worse, recharged my son's number with R60 airtime as I was going out so he could call me, and the airtime just vanished, called their customer service on 135, spoke to Khanyisa who told me that I have 3 subscriptions on my account which one is taking R3, R5, & R3 per day, and I asked him then what happened to the other R48 he couldn't answer , and he transferred me to the supervisor Zianda, and the supervisor said the same thing, I asked what happened to my other airtime, she couldn't give me satisfying answers and when I asked her to transfer me to someone who can assist she then hanged up the line, she said her name is Zianda MTN when I asked her surname, MTN excells when it comes to bad service.