Total bad client service

Am very disappointed with the client care department, my contract ended in January before this an agent called me regarding an upgrade which I agreed to and was told I have 10 days to cancel and that the contract will only be effective the following month however this was not the case so I called 3 days after to cancel my contract. I had to called more than 3 times before I got assistance with their line always cutting off when I reach the cancellation department. They sent me an sms stating that my all promotions have been cancelled, I called again and my called are always cut off when I get to the cancellation department today I received an email saying I owe them 2700 who is supposed to pay for their incompetence and bad client service. I feel this is uncalled for and a serious financial inconvenience. From the beginning of this contract to date I have had to go back and forth I really wonder how they refer themselves South Africa’s best network is it by trapping us to continue with their contract by ensuring that we are unable to cancel their services because of their incompetence.