MTN - No response / Cannot get hold of anyone

In May MTN double debited my account. After calling them this was corrected, however this month they have done it again. I have tried to contact them via their 135 number but cannot get to speak to anyone. Every option is automated and does not speak to my issue. I have mailed them several times on their customer service e-mail. After numerous times of following up due to no response they FINALLY sent me a mail. In this mail they are requesting my pin, ID nr ect to verify me. Needless to say - apart from the fact that they want me to share confidential information via e-mail (this could be someone trying to **** me) I can still not speak to anyone. I explained to them that I am not going to share this info on a mail (due to the risk of identity theft) and they mailed back asking for THE SAME INFO AGAIN! Can someone (a person) please contact me so we can get this issue sorted out. Not all of us have money lying around to accommodate double debits. MTN Ref nr ***