3 queries logged, no response

I logged a telephonic query early May 2015 via the MTN call centre. This was with regards to roaming charges of over R2,300. I can prove, according to the usage records on my phone, that I used no data, sent no sms's, made no calls, and only answered 2 calls lasting just over 2 minutes relating to the period of the charge. Charges are clearly incorrect as this would indicate a charge of over R1,000 a minute for the calls received. My account was blocked after only 1 day spent in Dubai relating to these charges.<br> <br> I received no feedback after the above query, therefore I logged a query on the MTN Active portal on the 6th of May 2015 (reference number ***). This query was closed without feedback, therefore I logged another query on the 9th of May 2015 (reference number ***) - no feedback received to date.<br> <br> All I request is an explanation of the charge. The next step would be legal action to elicit a response.