Billing query

Im extremely dissapointed with Vodacom.I was billed for vodamail which I never signed up for. Instead of crediting my account they refund it as airtime and yet I made it clear that I don't want airtime it must be refunded as account credit.I was now told by Riaan from customer care that I need to go to the Vodacom shop to have that sorted out after numerous queries.Im still billed for that email and there is airtime I don't need nor use allocated to my number.I don't want airtime,credit my account with that Vodamail amount billed and expected to pay this month. Why must I be inconvenienced and go to the store for something I never requested.So dissapointed in the level of service from Vodacom.