Vodacom charging more than contract amount

I have recently experienced a problem with my Vodacom contract ,my contract amount is R199 and I pay an additional R10 for caller ID and suddenly my account is R271 with no explanation as to how they arrived at that amount and when I try to log into my account it won't let me .. I have had a problem before where it said I had subscribed to something called hunky dory and daily R10 would be taken off my airtime balance.. when I queried it they said it was cancelled .. the only reason it was cancelled is because I cancelled it .. and no refund was done on my airtime even though I had no part in the subscription.. I am so disappointed