********* behaviour

I have been with Mtn for many years, without any problems. I have also had an iphone for a couple of years and i know how it works. I recently upgraded my phone from an iphone 5s to iphone 6+. i was on a R200 and moved over to a 200 min contract that was capped., or supposed to be capped. The agent advised me that i should use all my airtime and data before the 21st of July as my new contract would take effect then. This morning i tried to mak a phone call but was unable to do so. My service had been suspended. When i phoned to find out what was going on the call centre agent advised me that my account had been suspended due to the data usage from my phone to the value of R2000!!! She also advised me that this amount was incurred before my new contract took effect. I have bought a fortnightly bundle, as well as a monthly bundle during that month as i have been doing the 20 months prior. No one can actually tell me what had happened or why there has been such a excessive data usage. I'm now going to have a bill for over R3000!!! I feel violated and let down by Mtn. Apparently my phone was not capped on the new contract either. Come on!!!