POOR SERVICE AND UNAUTHORIZED BILLING

I have a contract with Telkom that I pay R139 a month for 10GB of data, payment is made via stop order as agreed. In August on two occasions, Telkom had debited my account with ********** amounts. When i called the call center, i was informed that there is a "R500 spend limit" that is imposed on my account, something that i was not informed of. The consultant said that when my data runs out, i get to use that amount. To my surprise, because every time my data runs out i buy prepaid data from my own pocket. Why is this thing happening now, and who authorized them to debit my account at anytime they want to while we have an arranged stop order. I am 18 months into the contract and this starts happening now, on top of that, i have been waiting for a copy of my contract and i also do not receive my statement. Telkom must cancel that spend limit as i never authorized it, and put my account back in order as it was previously and remove all the money that they say i should pay, otherwise provide me with proof that i authorized the spend limit on my account with them. I have to resort to this as every time I request an email address for complaints, I am given wrong addresses. I am so disappointed with them.