No response to repeated queries after 3 months

Since September I have trying to change my vitality membership after being incorrectly advised to downgrade to Vitality Active. I was asked to pay R1990 to back date my membership which I did. But my membership was not corrected. Three call centre operators promising to fix the problem later and still nothing. Now my miles and points are gone. No one responds to emails. A call to the call centre this morning resulted again in many promises that I would get a call back. Again nothing. I have thousands of rands in benefits from food rewards to miles that I should have access to. Truly insult to injury.