still no response

I sold my vehicle on the 19.01.2015 and cancelled the vehicle I added on the replacement my account was only suppose to be debited with R100 and something for the pro rata on the new vehicle because of the balance they kept for the sold vehicle but my account was debited with over R500 and something the premium for my whole policy is R1564.40 but on the 6th they debited R1658 when I phoned to query this the lady said she will phone me back she has to speak to a manager. There was no missed call on my phone but a sms was sent that they tried to call me and till today I heard nothing from Miway.