Incorrect Data Balance costing me over R1000!!!

I have been a MTN client for 10 years, and I have always loaded data from my usage limit when I see I am running out of data. This morning I tried to load data and could not as it said I did not have enough fund available from my usage limit.

I called the call centre to assist and was advised my usage limit of R1350 was depleted by my out off bundle data usage. My balance still showed a balance of 16kb and the consultant said the balance showing was incorrect. How am I suppose to monitor my usage if MTN cannot provide correct information on their balance enquiries?

I must now pay over R1000 for data, when I could have loaded 2GB for R99 as I always monthly when my monthly data runs out.

Is MTN deliberately giving us incorrect balances so they can ****** money from us?... seeing that only their consultants know that balances are incorrect.