failing to cancel subscription that finishs my airtime on this number ***

Vodacom this day is not easy to call the call center due to this new robot sms chat system. I have problem on my sim card when i load airtime just finish like that so when i try to call vodacom call center on 135 it doesn't give that option of speaking to consultant so that i can cancel those subscription that finish my airtime instant it divert me to sms option, it so boring, it is boring. can someone help this is my number ***,