Frustrated and annoyed

I have a problem with Vodacom whenever I recharge with R55 airtime they take my airtime and claim that I've subscribed things which only happens when I recharge with R55 but when I recharge with less than that I don't experience such trauma I am experiencing.I've recharged on the 5th and I didn't use even R1.Vodacom took my airtime. I am disappointed by this service provider because I don't owe anything but they are *****ing from me. I've logged a call from them but I haven't received my airtime instead of returning my airtime they closed my case without resolving it,it means I am a fool.How do I trust them again ? I am been harassed as a customer. I have to wait for them in order to use my airtime.This is bull nxa