Still waiting for response

After being billed a ridiculous amount for my five CellC accounts I was informed by one of the agents that it was because of my expired data contract. I asked her to cancel the contract and she said I must contact the cancellations department. I sent a cancellation email on the 31 March 2015 and I am still waiting for a response. I do not see myself renewing the other contracts mid-year if this is how you treat a loyal customer.