Vodacom have no concern for their customers

When my data on my phone is about to run out I get an sms stating this and that 1gb will be automatically purchased for R115 when it runs out. I have tried repeatedly to get it canceled and have called Vodacom many times as well as actually going to their head office in Midrand. They finally said that I gave to go to their app, select buy, then select data refill, then select opt out. This defies logic and is pathetic. Even after doing this I still received another notification of data running out. Does anyone at Vodacom actually care about their customers? I am going to contact the Consumer Protection Board and hopefully can get some assistance.