Vodacom is ridiculous

I purchased R110 airtime, last night and I bought data for R13 for 100mb, then this morning I purchased data twice for R2 for 30mb. And my balance is R16! Meanwhile at 8h00 before I purchased the data my balance was R86. I'm disappointed in the call centre service because when they were trying to decipher all my data usage they had discrepancies in their time line when I confronted the, with the details they were giving me. At the end of the call the lady said I must go to the nearest Vodacom shop if I want to get reimbursed if it's their fault for billing incorrectly. Like now I must leave my home and spend more money travelling when she could put in a bit more effort and call and Vodacom shop while I hold and sort it out? I'm definitely porting to another network! Very dissatisfied!