Membership Cancellation

On the 1st of October I cancelled my membership with the medical aid. I was told that they would get back to me within 3 days. I called on Friday and the call centre consultant said they are more likely to call me later in the day since they knock off at 7pm. After no communication from them I called again yesterday and was assured that first thing today they would contact me to process the cancellation. I don't want to find myself in a situation where my cancellation request has been declined since it wasn't done "timeously." On the day that i cancelled I was told that I cannot do it later than the 1st of the month.