Unfair

I have been a Telkom customer for over 4 years now. I just cancelled my contract with them, you will get steps on how to cancel your contract but you will not be told what to do with your sim card after the contract has been cancelled as it stands I can not send out a simple please call to other people. I can receive calls and now when I tried buying myself data "Mo'nice" deal and it gives me an error message saying that the number is not eligible for any deals. If I have been a customer for over 4 years why must I experience problems the moment I switch to prepaid ? Are things not meant to be easier ? Now lets talk about the 081180 number that does not allow you an option for the contact Centre . It really is difficult to get hold of Telkom people when you want them but they can annoy you as hell when they want you take out a contract or when they notice that your contract is about to end, even when you have informed the previous agent that you will not be taking out a new contract.