****** of data on a monthly basis

Hi Mtn. Can someone in the complaints department please urgently contact me. I have been trying to resolve an issue for the last 5 months regarding the data that I purchase out of bundle. I get my monthly 2 GBs of data on the 12th of every Month. I generally purchase more data before the 12th. For the last 5 months , I have experienced that the new data received on the 12th gets used up before the older purchased data. I generally purchase 1 week bundles and generally they expired with 1 GB remaining because of the above issue. I have literally been ****** of more than 5 GB of data in the last 5 months because of this. I have logged several queries with your agents who have not been able to resolve it in the last 5 months. I call every month. I’ve finally had enough and will probably move to Vodacom seeing that their data is actually cheaper now. My cell: ***. Please check your records for queries logged under my number above