Data charges query and no reaponse

I received a bill of R5000 which includes R4000 for Data usage even though I bought a 4gig bundle and 1gig with loyalty points in the same month. I do all my updates via wifi only and download now and then. Nothing more than 150mb episodes of series. I then went to mtn in Cape gate and requested a data usage report so they logged the query and I was expecting a email within 7 days as they promised. 2 weeks later I went their to find out what's happening as I was still waiting for a email. They checked the system and mtn rep**** to the store with : billing is correct. That's it. I logged another query and 2 weeks later went to the store and they told me the query was closed because nobody attended to the matter. REALLY???? So I logged another query and sent 2 emails myself to customer service and a week later got a email with a link to MTN active. ***??? I want a url report on my data usage. It's been 6 weeks. My phone will be suspended soon as I refuse to pay this bill. This is clear ******* as MTN can't provide me with my data usage report. The service is pathetic and MTN is a *********** network. It is disgusting. I will be moving to another network as soon as this is resolved.