Extremely terrible service

I am extremely annoyed at the service given by Spark. My nephew was in aftercare till march... sent an email on time to cancel the service but was still charged aftercare for the following month. I sent account the email with the cancellation. The amount has still not been reversed from my account to date and no one has acknowledged receipt of the communications.They sent me an invoice for my nieces late pick up... sent an email back stating to clarify I was charged incorrectly and haven't received any feedback from Spark. Your policy on customer service is very poor... yesterday I was sent a mail saying the invoice I was sent month end for the fees due was sent incorrectly BUT I HAVE ALREADY PAID. Please get me a person who can sort this out.