Netvendor Hillcest

I have been trying, hopelessly to get assistance from Netvendor, Hillcrest. I have been debited with a fee of R438,56. I have phoned several times and emailed the query several times, but with no luck. I have now run of airtime and cannot keep purchasing airtime to query this fee. The consultants don't seem to be very knowledgeable, as they make you wait and then cut you off, without an answer. I did not authorize ir purchase electricity for such an amount. I require this service fee reimbur*****t immensely, as it is affecting my electricity budget.