Misled customer escallating to huge premium increase

I received a phone call on 1 September 2024 from Vodacom informing me they will be DECREASING my premium as I am paying to much. At that stage I was happy and asked the telemarketer twice to confirm that my monthly premium will decrease. Both times he confirmed YES DECREASING. I then received 3 email quotes a few days later informing me that my total premium per month on 3 x contract phones will be INCREASING with almost R600 pm. I was really upset as that was not what I was told. Two of these phones is paid off already. I send 2 emails to Vodacom asking them to urgently reverse but up to date no response. I then visited Vodacom this morning at Cape Gate and was told that the 2 paid off phone contracts were extended and my phone upgraded (912026), which was already upgraded approximately a year ago. One phone's normal premium was R84.99 and increased to R280. The other phone's premium was R285.00 and now iR475. Mine increased from R418 to almost R800! I have NOT given Vodacom permission to extend or upgrade any off these contracts. I also did NOT give permission to increase any premium. I urgently need all 3 contracts premium to be rectified to my original premium before Vodacom messed up with my account. Total premium on my 3 x cellphones must be R1,022.78 and NOT R1,612.79. I urently await Vodacom to send me written confirmation that reversal was done and premium rectified to R1,022,79. I await Vodacom's response. This is not how clients needs to be conded and treated after being a loyal customer for many years. How many customers must be mislead before Vodacom listen.