Mislead from the call center agent and bad attitude from the store sales assistance

I took out a cellphone contract with telkom mobile on the 13th of August 2017, on the 16th of august i called the customer care line to find out in how long do i have to take out insurance for my device and the agent advised i have through out the duration of my contract which is 24 months to take out the device insurance, i was advised i will have to visit the store to do and i was happy with that. on the 20th of August i went to the store in the phoenix plaza and i was told it is too late for me to take out insurance for the device and i must go else where to try and get insurance as i have passed the 7 days with telkom, the sales assistance was so rude and i was given no assistance at all, i was advised the call center is a franchise and not telkom direct, since i was advised by a call center agent that i have up to 24 months to take out insurance then i must call them. I was disappointed at such service and i am determined to contact Icasa and i cannot carry a device that is not insured, i require insurance for this device and i expect you guys to provide me with the device insurance as i was told by your customer care agent that i have all the time in the world to decide if i want it or not. i have the recording and i will make use of it. should you not be able to provide me with the device insurance i want to cancel my contract.