***** transaction was done on my account & they di

I have a contract with mtn, i was paying R269 monthly from my last upgrade done late last year, in July 20th R822.03 was debited by mtn from my account without my permision, when I called the 808 line to enquire abt this I was told there was another line linked to my account in June which I never did. They told me to send an affidavit & Id copy, I emailed it to Tholokwakhe Mabokela who gave me a Ref no & tht was the 23/07/15 but since then No one has contacted me from mtn, instead I've been calling and emailing stil no response, when i called someone would refer me to another line which is never answered, when it goes bck to tht person they hang up. I've asked mtn to give me documents that were signed on the day the application was processed, the name of the employee who processed everything & the brnch where it was done as i need to open a case on my side as this is not the only ***** I'm dealing with, so i need as much info as possible to get d person responsible but Mtn refused to give me any info &told me to wait for their investigation which has not even contacted me to atleast say they are working on my case...big company bt doesn't knw how to treat your customers,SAD!!!