Termination of a contract ***

Just tried to cancel one of my contracts I've had for a long time. Cellc asks stupid questions to try and lock you in. You must give them the exact amount debited last month and how long have you had the contract, over 20 years or 15 years. They don't ask you the same questions when taking on a new contract. I've been a loyal cellc customer but I need to start looking for another service provider. What is this? I want *** cancelled and made to prepaid.