Incorrect loading of Wifi data

I normally receive 10Gb Anytime data and 10Gb on the 1st of every month. On the 2nd of December 2017 I tried to use the wifi and was unable to use it. I checked on the mobile app and saw that there was no Anytime data but there was 20GB Midnight data.I called in on Saturday and was informed my wifi data was loaded incorrectly and that it would take 24-48 hours for the problem to be fixed. I have called in on Monday again to check on the progress of my query as I did not receive feedback like I was promised and was informed again that the data was loaded incorrectly on their side. I called again on Tuesday after still not hearing back from them in regards to my query and again I was informed that they would sort out the problem on their side because they made the error. I called again on Wednesday and was informed that they did load my Anytime data and that this was depleted and that the 20Gb midnight data was carried over!!! My data is never carried over to the next month. I need an urgent response to this query as I pay my account every month and this service is unacceptable!!!!