Data roaming ******* when abroad

I visited Australia in Dec for a month. On the 2nd day I recd an sms from AP stating data usage was over R1k. Impossible since all data usage was via my hosts WIFI. I then bought an AUS simm card & moved my SA simm to my old BB with data switched off. I then recd an sms saying data usage was now over R2k so I switched the BB off. After 10 days I switched it on to check SMS's & recd an SMS saying data usage was now over R6k. I switched the BB off until after my return to SA. I then stopped the AP debit which was now R8430 & logged a query with AP (ref 566525). On 16 Mar I recd a call from AP saying I must pay this to avoid being cut off, and telling me to re-log the query to MTN with a copy of my ID. I was then blocked, & was told by Koena that if I paid my normal monthly amount I would be re-connected. This I did but was cut off again after 5 days. I have now been totally blocked & told the investigation could take 8 weeks. This unfortunately is the end of the line of a 15 year relationship with Autopage. This is a common occurrence with MTN clients traveling abroad but they are unwilling to rectify it - so now it is pre-paid with Cell C & MTN & Autopage are surely the losers