Disappearing airtime

Seriously yet again another R120 got deducted and this time I got told that the no. in question is register to mtn services according to the report they received, I was advise to go to [URL Removed] ,I went to the website as instructed only to find myself on the actual mtn website to view what deals available and nowhere are u able to unsubscribe I was also informed to call mtn customer care which I done and every agent informs me they can't help me because I'm with one2one ,I've got full BIS service yet everytime I try to use my phone e.g whatsapp I'm being charge ,I spoke to a supervisor which is still no help . All I really want is someone with more authority to take ownership and look into my dispute seeing that I'm left in limbo.