Cancelling contracts

If a customer calls to cancel their account please understand the following: There is a reason why the person wants to cancel be it affordability, connectivity etc. Please STOP TRYING TO SELL ANOTHER PRODUCT FROM VODACOM!!! It really is so darn annoying. I've cancelled my contract as I get countless calls for upgrades and I did not want to upgrade. Have another contract that's still ongoing, but I'm really considering cancelling that as well due to spam from vodacom.