Just in case anybody else is having the same thing, I called MTN after receiving a disturbing SMS from MTN's 808 number (I have replaced x's with the actual credit limit):
Seeing the possibility of being liable to pay thousands of rand that I was sure I didn't use, I looked on my MTn Active page, where it showed that a large sum was dedicated to something called PSD Calls - essentially a data connection.This is a friendly reminder that you have exceeded 90% of your Credit Limit of Rxxxx.xx . Regards MTNSP
It seems that if you are on an Uncapped Product from MTN, the data that you transfer is not zero-rated from the moment you exceed their soft-cap (in my case, 3GB), but is delayed to your invoice date! Some people may not think this is too much of an issue, but as soon as you 'exceed' your credit limit, MTN will cut off any internet access.
When I called MTN's helpdesk, I was told that I had two options:
- Increase my credit limit (so anyone with access to my router can just plug a landline in and call to their hearts' content, and I'm liable for any and all costs)
- Call them to manually reactivate access on my account once I have reached my credit limit (so I don't have internet for a while)
Surely there is something wrong here!