Ridiculous

I had this issue a while ago of a high bill. Last month was over R400 again, and I have put a cap on this. R712 has now been debited off my account. With a cap on it! It is getting worse! I went on twice in Feb! My automatic updates are off. I went on to check my usage and it says I still have 114mb so where does R712 come from?! Last time is says I was using a Hawei now Ia using a blue Samsung. This is enough now. E mail customer care and it comes back undelivered. Also. My debits are scheduled for the 1st! Not the 28th!