Vodacom unconctactable via email or online chat.

On 23rd January I went into the Vodacom shop in Brooklyn Mall in Pretoria to review the contract I have for data for the children of the lady who used to work for me. I was sold 2 x 10GB data plans at R149pm. I have received an account for R578.00. I am currently overseas and unable to call Vodacom. There is no email address and the online chat does not work. I tried to get an email address from the number given to call internationally but am advised that there is no email and I have to spend the time on the phone on an international call trying to resolve this. All I want from Vodacom is an email address where I can address the problem I have without having to spend copious amounts of time on an international phone call.