Finrite/Vodacom

Without any notification my vodacom device insurance increased conveniently after my 2 year contract expired. I contacted Vodacom and received a reply from Pinky Mdekaze stating that I received a notification via sms in May/June. Her "don't care" attitude is quite pathetic. I requested proof of this sms which I received reply with my contract and a section highlighted whereby it states that my insurance premium can increase with a notice from Vodacom. I responded by stating that the number on the contract is completely wrong and still Pinky tells me to read through thw t's and c's, ignoring my email where I notify her of the incorrect number. She takes days to respond and her attitude is disgusting!!! How would I receive a notification if the number is incorrect?!!!