Vodacom - Roaming Charges of R3000 !!

I traveled to China this July/ August. I called Vodacom to ensure that international roaming was activated on my account. On arrival in Dalian China I tried to connect to internet on my phone and could not, nor did the sms I sent my family to say I had arrived safely go through, therefore roaming was not working for me. I turned off roaming and data on my phone and used the FREE WIFI at the hotel where I was staying or at coffee shops. I never recieved a single phone call or sms on my phone for the entire month until I arrived at Hong Kong airport where I tried to connect to roaming to check filight details. I received my first sms in a month saying my data roaming balance was R2000 (it is now R2800 on my statement ). I turned off roaming and used airport free wifi. I called Vodacom immediately on my arrival back to SA on 18 August, lodged a dispute and was given a ticket no. I was told they would investigate and would get back to me within 14 days. I have called 3 times and have been told someone will come back to me.There seem to be many such Vodacom related disputes in the media and on this platform. I will not pay until Vodacom proves to me what I am paying for.