Vodacom customer service pathethic

I have been with Vodacom for over 20 years. Received a call from an agent stating that he can save me on my increased contract amount. I stated that I am not interested and that my contract amount is the same and I am happy with that. This concerned me and I requested them to send me statements to new mail address, and low and behold they have increased my contract with over R250 a month! I have sent mails disputing this amount and change without any response from Vodacom. I have now returned the debit order, and will cancel the contract if they do not sort out this matter. There is just no service whatsoever in terms of response!