Very disappointed

I have been a customer with Miway for about 3 years claim free and was residing at the same address. So on the 12th of June 2020 i called to update my address since i had moved. I was then told that my premium was changed from R696. 91 to R736. 01 and the Debit order date is on the 30th of each month,however today 27th of June 2020 they deducted an amount of R845.40. They tried to deduct an amount of R59. 39 in May after receiving my monthly premium, the R59. 39, was not available then and they immediately canceled my coverage with them with no call and explanation. My question is. Why deduct on a date that was not documented and with the wrong amount? They couldn't amend my premium to be lower since the pendamic which i asked them on the 12th of June.I'm Really disappointed