Unacceptable billing ridiculous

I have called rain several time to cancel the devices allocated to me as they keep billing me for service am not using I spoke to the agent from rain about 2 - 3 weeks ago and she arranged for collection of this devices and told me both been cancelled and arranged for collection as at then the bill was 2700 which I have made arrangement to settle to my surprise just now checked the rain app and find the bill has increased again to 3900 what the hell is happening to rain this is absolutely unacceptable and can’t take it anymore I can’t be at fault for you having *********** agent and system failure that just put client into dept now I must run around mind you am not going to pay 2700 dept as agreed rain to sort out all this nonsense