Couldn't care less!

Fri 26 Sept handbag containing phone was ******. Sat morning went and got a new SIM card. On Sunday after calls to help desk determined that the ******* had rolled up approx R2500 bill on the SIM before it was disconnected for them. They appear to have bought a huge amount of time which is showing as a balance against the account. I have tried many times through the help desk to ask if MTN could simply reverse the ********** transaction(s) made. I have been told that there is an MTN ***** dept but when I use the numbers given to me by the help desk an automated reply tells me 'incorrect number'. I phone the MTN in JHB ask to be put through to ***** dept and after long waiting just simply get cut off. My request is simple - the time bought **********ly is showing on my account, so please reverse the transaction. MTN won't take my request let alone offer some assistance. They tell me that I should have contacted them immediately and wash their hands of it. I am disgusted!