incorrectly billed every week

I pay my account every month and at least twice in a week but the amount overdue still goes up even though im not buying anything on my account since April. I have queried with the store and they called accounts department for me. They explained to me that I wasnt paying the correct amount all along, which I disputed with them as I was paying at least 3 times in a month.<br> <br> I also cancelled the insurance which I had signed for R50 but I was being charged R79 for it. I paid my account again this week and went to the store 3 days late only to find out that the amount overdue is again higher than the last payment. I have had such a bad experience and im ****** daylight. I will never encourage anyone to open any account associated to Jet. I just want a corect amount and settle this account as I now have a negative credit record because of Jet's mistake.