Bad service, accounts and call centre

I've been a customer for a long time with various products/contracts. I even called you and tried numerous times to take more consolidated products with you earlier this year - but you did not even want to help me - I have email trails of this as proof - It was an opportune time as most of my contracts were ending and it would have been nice to get everything from one place - but because of your poor service and lack of assistance - you lost lots of business with me - BUT THIS LEADS ME TO THIS ISSUE. I am still on the Internet Promo 5 contract - even though my contract has ended - I am on it month to month. I got a call from your call centre last week saying that there is a new contract and I should upgrade. I dont want to take on another contract because your network is poor in my area. Your agent told me that if I do not upgrade, the promotion I am on will end soon and I will be charged R900 a month - but cannot tell me when that will happen - which I think is absolute nonsense - how can you not tell me when it will revert to the normal price? I would like to end my data contract at the end of this month. Please bill me of August only and end my service at the end of this month!