Respect my decision to cancel my contract by making the process painless!

I have many contracts with Vodacom but the service and rapport have received lately, made me decide to cancel all my contracts as they come to the end. To that end I was put through to an agent Alicia Pillay who absolutely reinforced my negativity toward Vodacom. Calling to cancel a contract is painful and long winded with the goal of getting the person to upgrade or take a new contract. I have 6 contracts and don’t want to go through – what I would describe as harassment each time I need to cancel a contract. How can I cancel my contracts with a quick call or email? Without Vodacom taking up my time to questions my decision?