Vodacom upgrade

i was a very satisfied customer, but until today. its my time to upgrade my phone contract and went in today and they told me i cant because i am on a low risk profile i should have phoned Vodacom and asked for a upgrade on my profile since they are on a new system. I feel like they should have told me before when you sign up for a upgrade. I then phoned customer service and complained at them and they said its based on my credit score then i told them what the store said and they said oh okay we wil do a review on your account. I am sorry to say Vodacom i am canceling with you guys. unless you sort your situation out. I would have understand if they told be before hand if you want to upgrade then you must boost your profile.