MTN data ripoff - need to speak with a human!

I loaded 20GiB data on an MTN prepaid SIM . This is for a small business: email, web browsing: NOT da******ensive activities like streaming, etc. 20GiB usually lasts me a month. However, I loaded it Tuesday 5th September, and have been struggling to connect ever since (however, I didn't use it at all over the weekend). Today (Monday 10th) I took the SIM out of the WIFI router and put it into an old phone to check the balance: everything is zero! The worst thing is that there is no way to speak to a human at MTN, so I find myself having to complain here. I was formerly with Telkom Mobile, and found them a pleasure to deal with. The only reason I changed was that I was having connectivity issues in my area.

So I have allegedly used up an entire month's of data - R899.00 - is 5 days, despite the fact that the connection was spotty at best? And it wasn't used at all at the weekend?