Premium Increase - With System Errors?!

I received communication from Discovery Insure that for one of my vehicles my premium would not be increased as I had achieved Diamond vitality status. However on calling the call centre to query the overal 9% increase on my plan premium I was informed that the premium had actually been increased for both vehicles on my plan. They said that this was a system error and would get back to me in a few days after they rectify the error - which worries me that we are getting system errors of this sort that involve money that I'd have had to pay. I am not happy at all about any of this, I'm not happy with the information that was incorrectly communicated to me. I cannot help but wonder what would have happened if I had not picked this up especially now when we're hardly driving anywhere.