CellC just does not respond to my query.

In July I updated my contract over the phone. The agent stated that I would receive 450 minutes talk time and 3 or 3.5 gb of data per month. At the end of July this was not updated on my contract. I contacted CellC and was told that it would only update on 1 October. When this date arrived the data had still not been updated. I contacted CellC and was told that my query had been escalated. Previous experience has taught me that when I am told that a call is escalated, this just does not happen. I have contacted Cellc per telephone, as well as per email. Had a call from an agent yesterday, who duly cut me off. This has happened on numerous occasions. In the meantime I have to purchase extra data at an extra expense.